Dr. Jim Roberts, Professor of Physics
 
 
  Department of Physics
P.O. Box 311427
Denton, Texas  76203-1427		 (940) 565-3022
General Academic Building, Room 525I
roberts@unt.edu
 
   
Links:       Dr. Roberts' Web Page

Regional Collaborative Notes

 Region X Local Collaborative

 UT Austin Texas Regional Collaboratives

 

Education:      

Ph.D., The University of Oklahoma, 1967.
Engineering Physics

 

Research:       Dr. Roberts has conducted workshops for the past eight years dedicated to training teachers to teach science and mathematics in public schools.  Over 250 teachers have been impacted through the program with at least 10,000 students impacted indirectly.  His teaching tenure has been dedicated to helping relieve the science deficiency in American schools.
Publications:        
  1. "Linewidth of the Microwave Inversion Spectrum of Ammonia," (with R.L. Legan, E. Rinehart and C. C. Lin) J. Chem. Phys. 3, 4337-4345 (1965).
 
  2. "Doppler Contribution to Microwave Linewidths," (with R.W. Parsons) J. Mol. Spectrosc. 18, 412-417 (1965).
 
  3. "Self and Foreign Gas Broadening of the ΔJ=O←I Line in the Rotation-al Spectrum of Methyl Chloride" (with R.W. Parsons) J. Mol. Spectrosc. 20, 195-197 (1966).
 
  4.  "Linewidth of the Rotational Spectra of Symmetric-Top Molecules" (with T.K. Tung and C. C. Lin) J. Chem. Phys. 48, 4046-4049 (1968).
 
  5. "Hyperfine Structure in the Inversion Spectrum of NH3," J. Mol. Spectrosc. 30, 351-353 (1969).
 
  6. "An improved Microwave Linewidth Spectrometer," Rev. Sci. Instrum. 40, 935-938 (1969).
 
  7.  "Linewidth Parameters for the 1<J<8, K=I Lines of the Inversion Spectrum. of NH3," J. Phys. Chem. 74, 1923-1926.
 
  8. "An Experimental Study of Microwave Spectral Lines in Gases," (with R.P. Netterfield and R.W. Parsons) J. Phys. B; Atomic and Molecular Physics, London, Engl.) 5, 146-167 (1972).
 
  9. "Experimental Microwave Collision Diameters in the Rotational Spectrum of H2CO," (with D.V. Rogers) J. Mol. Spectrosc. 46, 200-206 (1973).
 
  10. "Cavity Perturbation Technique for Determining the Presence of Molecular Ions of Helium in a d.c. Discharge Plasma," (with M.W. Congleton and R.H. Freeman) J. Chem. Phys. 59, 866-872 (1973).
 
  11. "Linewidth Parameters ΔJ=+1, 0<J<43, Rotational Transitions of the Sulfur Dioxide Molecule," (with W.H. Yang and B.J. Tejwani) J. Chem. Phys. 58, 3797-4916 (1973).
 
  12. "Ion-Acoustic Waves in a Bounded Plasma" (with B.S. Tang) J. Appl. Phys. 44, 3796-3797 (1973).
 
  13. "Electron Collision Frequency Observations in H2, D2, N2, CO2 and Argon at Pressures of 0.4-2.0 Torr (with R.H. Freeman) Plasma Physics 16, 377-383 (1974).
 
  14. "A Method for Measuring Relaxation Times for Collision Processes in the Surface Layers of Conductors and Semi-Conductors," (with L.W. Childress and K.H. Hong) Phys. Lett. 46A, 433-434 (1974).
 
  15.  "Microwave Properties of Liquids and Solids Using a Microwave Cavity as a Probe," (with K.H. Hong) J. Appl. Phys. 45, 2452-2456 (1974).
 
  16. "The Effect of the Sample Iris in Determination of Delectric Constants Using a Microwave Cavity," (with K.H. Hong) J. Korean Physical Society 7, (1974).
 
  17. "Microwave Collision Diameters for Q-Branch Transitions in Monomeric Formaldehyde," (with A.C. Venkatachar) J. Mol. Spectrosc. 57, 166-68 (1975).
 
  18. "Microwave Collision Diameters for Q-Branch Transitions in Formic Acid," (with A.C. Venkatachar) J. Mol. Spectrosc. 62, 3364-3365 (1975).
 
  19. "The Measurement of Pressure Induced Shifts in the ΔJ=0←1 Transition of CH3CI at Various Temperatures," (with I.R. Dagg, Canada, and R.W. Parsons, Australia) J. Mol. Spectrosc. 63, 241-248 (1976).
 
  20. "Linewidth Parameters in the Rotational Spectrum of Methyl Cyanide," (with D.L. Swindle) J. Mol. Spectrosc. 77, 94-101 (1979).
 
  21. "Dielectric Changes in Hyaluronate Solutions at Microwave Frequencies as a Function of Concentration, System Ph and Temperature," (with S.K. Jani and J.N. Dahiya) J. Biopolymers 19, 934-944 (1980).
 
  22. "Phase Transition Studies in Polar and Non-Polar Liquids at Micro-wave Frequencies," (with J.N. Dahiya and S.K. Jani) J. Chem. Phys. 74, 3609-3615 (1981).
 
  23. "Molecular Probing at Microwave Frequencies as a Means of Studying Atmospheric Motion and Composition," Proceedings of the 17 h Space Congress, April 30-May 1,2, 1980, Coco Beach, FL, Section 2, 31-3& (1980).
 
  24.  "Linewidth Parameters in the Rotational Spectrum of CH 3C15N," (with J.K. Messer) J. Mol. Spectrosc. 88, 231-233 (1982).
 
  25. "Theoretical and Experimental Pressure Shifts in Some Select Rotational Transitions of the Methyl Cyanide Molecule," (With J.K. Messer and B. Khoobehi) J. Chem Phys. J. Chem. Phys. 76, 2914-2918 (1982).
 
  26. "Dipole Moment of the ΔJ=+I Excited State of the CH3C14N Molecule," (with J.K. Messer) J. Chem Phys. 96, 351-352 (1982).
 
  27. "Linewidth Parameters in the Rotational Spectrum of Nitrogen Dioxide," (with M.N. Moazzen-Ahmadi) J. Mol Spectrosc. 96, 336-341 (1982).
 
  28. "Infrared-Microwave Double Resonance of the S02 and NO2 Molecules" Spectral Line Shapes Z Walter De Gruyter and Co., Berlin (1982).
 
  29. "Inrared-Microwave Double Resonance Probing of the Population-depopulation of Rotational States in the NO2 Molecule" (with B. Khoobehi) J. Mol. Spectrosc. 97, 227-233 (1983).
 
  30. "Pressure Broadening Theory o~ Asymmetric-Top Molecules Using the Methods of Irreducible Tensor Operators" (With M. N. Moazzen-Ahmadi) J. Radiative and Quant. Spectrosc and Rad. Transfer 30, 229-243 (1983).
 
  31. "Observation of Hysteresis Effect in Detuning of a Resonant Microwave Cavity" (with v. Prakash) J. Chem. Phys. 80, 4562-4563 (1984).
 
  32. "On the Calculation of Pressure-Broadened Linewidths for symmetric- op Molecules using the Modified Anderson Theory" (with J. K. Messer) J Mol. Spectrosc. 104, 308-314 (1984).
 
  33. "The Microwave Spectrum of Propyne in the 17-70 GHz Region for the Ground, vIO=1 and v9=1 Vibrational States" (with J. M. Ware) J. Chem. Phys. 81, 1215-1219 (1984).
 
  34. "The Microwave Spectrum of Propyne in the 17-90 GHz Region for the vIO=2 Vibrational State" (with J. M. Ware) J. Chem. Phys. 82, 5-7 (1985).
 
  35. "Experimental Linewidth Parameters and Dipole Moments for the propyne Molecule in the vg and vIO Vibrational States" (with v. Prakash) J. Chem. Phys. 116, 17-22 (1986).
 
  36. "The Microwave Spectrum of Propyne in the νIO=4 Vibrational State" (with v. Prakash) J. Chem. Phys. 84, 1193-1195 (1986).
 
  37. "Perturbation of a Resonant Cavity with Select Alcohol Vapors" (with V. Prakash) J. Microwave Power 23, 45-50 (1986).
 
  38. "Dielectric Response of Germinating Wheat Seeds Using a Resonant Microwave Cavity as a Probe" (with F. L. Shafer and D. Smith) J. Microwave Power 24, 167-177 (1986).
 
  39. "The Microwave Spectrum of Propyne in the 17-53 GHz Region for the vIO=3 Vibrational State" (with v. Prakash) J. Chem. Phys. 84, 1193-1195 (1986).
 
  40. "The Microwave Spectrum of Propyne in the 17-53 GHz Region for the vIO=4 Vibrational State" (with v. Prakash and W. M. Rhee) J. Chem. Phys. 120, 169-174 (1986).
 
  41. "The Microwave Spectrum of Propyne in the 17-72 GHz Region for the v9=2 Vibrational State" (with W. M. Rhee) J. Chem. Phys. 85, 6940-6944 (1986).
 
  42. "Quadrupole Structure in the Rotational Spectrum of the v8=1 and 2 and Ground Vibrational Levels in CH3C14N for the Frequency Range 17-56 GHz" (with I. An and W. M. Rhee) J. Chem. Phys. 86, 4725-4729 (1987).
 
  43. "A Comprehensive Model for Predicting the Rotational Spectrum of Propyne in the vIO=1, 2, 3, 4 and 5 Vibrational States" (with W. M. Rhee) J. Mol. Spectrosc. 126, 359-369 (1987).
 
  44.. "Rotation Components of the v8=1, 2 and 3 and Ground Vibrational Levels of CH3C N for the Frequency Range 17-75 GHz" (with F. Sabeh, I. An and W. M. Rhee) J. Mol. Spectrosc. 125, 348-357 (1987).
 
  45. "Dielectric Properties and Phase Transition Study of the K-15 Liquid Crystal Under the Influence of an Applied External Field Using a Microwave Cavity Spectrometer" (with G. K. Johri and F. Sabeh) 23rd Microwave Power Symposium, Ottawa, Canada; J. Microwave Power (1988).
 
  46. "Dielectric Response of Material Media Using the Detuning of a Resonant.Microwave Cavity" (with F. Shafer and D. Smith) Proceedings of the IEEE, Transactions on Electrical Insulators, El 23, 571-578 (1988).
 
  47. "Microwave Spectra of C Substituted Methyl Cyanide for the Ground and v8=1, 2 Vibrational Levels for the Frequency Range 17-56 GHz" (With H. Tam and I. An), J. Mol. Spectrosc. 129, 202-215  (1988).
 
  48. "The Vibration-Rotation Microwave Spectrum of Tagged Acetonitrile in the Region 17 to 75 GHz for the Ground, v8 =1 and 2 vibrational States" (With H. S. Tam), J. Mol. Spectrosc. 134, 281-289 (1989).
 
  49. "Rotational Components of the vI0=1 and Ground Vibrational Levels .of Propyne with C Substitutions for the Frequency Range 17-75 GHz"  (With H. Tam and I. An), J. Mol. Spectrosc. 135, 349-358 (1989).
 
  50. "Calculation of the Rotational Constants A and C for a Slightly Perturbed C3v Symmetric Top Molecule" (With H. S. Tam), Structural Chemistry, 1, 211-216 (1990).
 
  51. "A Study of Experimental and Theoretical Shifts in a Resonant Microwave Cavity Loaded With Polar and Non-Polar Molecules in Gas Phase" (with G. K. Johri and R. Ngoui) J. Microwave Power Inst. 24, 227-235 (1990).
 
  52. "Microwave Spectra of the 13CH313C15N and 13CH312C15N Molecules in the 3 v3, v7 and v4 Vibrational Energy Levels Over the Frequency Range 17- 95 GHz" (With G. K. Johri and M. AI~Share), J. Phys. B: Atomic, Molecular and Optical Physics 2d, 2531-1541 (1990).
 
  53. "Study of the Dielectric Response of Water Using a Resonant Microwave Cavity as a Probe" (with G. K. Johri), J. Physical Chem.  7386-7391 (1990).
 
  54. "Dielectric Response of Select Ionic Solutions Using a Loaded Microwave Cavity Operating Near 9, 21 and 29 GHz as a Probe" (with M. Johri and G. K. Johri) J. Microwave Power ~, 82-89 (1991).
 
  55. "Determination of Effective Potentials for Non-Polar Liquids Using the Continuum Model" (with M. Johri and G. K. Johri) , Journal of Physics and Chemistry of Liquids, Z!, 71-77 (1991).
 
  56. "A Theoretical Model for Determining Oscillator Strength Using a Non-Spherical Molecular Cavity and Measurement of the Be-Ne Laser Light Absorption Coefficient in Solutions" (with M. Johri and G. K. Johri) Phys. Chem. Liq., 2d, 101-107 (1991).
 
  57. "An Experimental Study of Collision Broadening of Rotational Spectral Lines of CH313CN in the ground and nvB' n=l and 2, Vibrationally Excited States at Microwave Frequencies" , (with J. Hajsaleh, M. AI- Share, M. Johri and G. K. Johri) J. Chem. Phys. 2a, 3416-3421 (1991).
 
  58. "Dielectric Response of Polyphasal Materials Using a Resonant Microwave Cavity as a Probe" (with F. H. Wang) Proceedings of the 14th International Liquid Crystal Conference, Pisa, Italy, June 21-26,1992, Vol II p. 807 (1992).
 
  59. "Dielectric Response of Polyphasal Materials Using a Resonant Microwave Cavity as a Probe" (with F. H. Wang and Bin Lu) Molecular Crystals and Liquid Crystals Science and Technology (1993).
 
  60. "Calculation of the Rotational Constants A and C for Isotopic Species of Slightly Perturbed CH3CN Symmetric Top Molecules" (With M. AI-Share, J. Hajsaleh and S. W. Qian), Structural Chemistry  5, 113-119 (1994).
 
  61. "Determination of Hydrogen Bonding in Water Clusters Through Conductivity (d. c.) Measurements of Aqueous Solutions of NaCI", (With x. Zheng. and Y. Zhang), J. Chem. Phys. 122, 1503 (1994).
 
  62. "Dielectric Relaxation in Water Over the Frequency Range 13~f~18 GHz Using a Resonant Cavity Operating in the TM010 Mode" (With H. Wang) , J. Mic. Power and Elect. Energy ~, 196-205 (1994
 
  63. "Study of Interactions in Aqueous Ionic Solutions of NaCI and Phase Transition in Water by the Measurement of Be-Ne Laser Light Absorption", (G. K. Johri and J. A. Roberts), Proceedings of the Saha Centenary International Symposium on Spectroscopy and Astrophysics, 4-6 October.
 
  64. "Behavior of Hydrogen Bonding in Water Over the Temperature Range 100<T<360 K" H. Wang, B. Lu and J. A. Roberts Molecular Crystals and Liquid Crystals Science and Technology, Molecular Materials, 4, (1994).
 
  65. "Teaching Science Through Observing Variable Stars" R. D. Benge and J. A. Roberts, American Association of Variable Star Observers (AAVSO), 23, 71-73 (1994).
 
  66. "A Period Study of the Eclipsing Binary GK Cephei", R. Benge and J. A. Roberts, American Association of Variable Star Observers (AAVSO), 23, 20-27 (1994).
 
  67. "Mapping the Sun's Path with a Pinhole Camera", Science Activities, 32, 24-27 (1995).
 
  68. "The Temperature Dependency of Some of the Thermodynamical Properties of Aqueous Binary Mixture Systems", (With Y. Zheng) J. Phys.: Condens. Matter 8 , 8089-8103 (1996).
 
  69. "Microwave Spectra of CD3 CCD in the 24 to 42 GHz Region" (With M. Al-Share)Mu'Tah Journal of Research and Studies 11, 71 (1996).
 
  70. "Microwave Spectra of  Deuterated Methyl Acetylene Molecule CD3 CCD in the 24 to 90 GHz Region" (With M. Al-Share, W. M. Rhee, J. Gadhi and  J. Hajsaleh.) Journal of The Korean Physical Society, 34, 215 (1999).
 
  71. "Computer Assisted Reduction of Experimental Data for the Index of Refraction of Water Systems", J. E. Gadhi, J. N. Dahiya and J. A. Roberts, Physics and Modern Topics in Mechanical and Electrical Engineering, Nikos E. Mastorakis, Ed., World Scientific Society, Military Institutions of University Education Hellenic Naval Academy, Greece, (2000).
 
  72. "Computer Analysis of Microwave Conductivity Response Data Taken on Select Superconductors",J. N. Dahiya, Mangal Dhoubhadel and J. A. Roberts, Physics and Modern Topics in Mechanical and Electrical Engineering, Nikos E. Mastorakis, Ed., World Scientific Society, Military Institutions of University Education Hellenic Naval Academy, Greece (2000).
 
  73. "Correlation Between Ring Growth in a Giant Redwood Tree and the Sun Spot Cycle", (With David Thomas.) The Texas Science Teacher, 28, 13-16 (2000).
 
  74. "Experimental Methods of Studying the Fluctuations of the Refractive Index of Binary Mixtures of Select Gases and Water" J. A. Roberts, J. N. Dahiya and J. E. Gadhi, Advances in Physics, Electronics and Signal Processing Applications, Nikos Mastorakis, ED, Military Institutions of University Education Hellenic Naval Academy, Greece (2000).
 
  75. "Dielectric Relaxation Behavior of Select Liquid Crystals Using a Computer Controlled Resonant Cavity" B. F. Draayer,  J. N. Dahiya and J. A. Roberts, Advances in Physics, Electronics and Signal Processing Applications, Nikos Mastorakis, ED, Military Institutions of University Education Hellenic Naval Academy, Greece (2000).
 
  76. "Radio Astronomy Activities as a Teaching Tool for Science", Tim Imholt, Raymond Benge and Jim Roberts, The Texas Science Teacher, 29,  #2, 44-46 (October, 2000).
 
  77. "Microwave Dielectric Analysis of Selected Materials" J. N. Dahiya and J. A. Roberts, J.      Microwave Power and Electromagnetic Radiation, (in press).
 
  78. "Utilizing the Sun as a Teaching Tool for Scientific Observation", Tim Imholt, J. B. Scott and Jim Roberts, The Texas Science Teacher, 30, 20-25 (2001).
 
  79. "Introducing Technology into the Classroom by Working With the Oscilloscope", John Bartholomew and Jim Roberts, The Texas Science Teacher.
 
  80. "Determination of the Celestial Speed of Electromagnetic Waves Using Changes in the Delay of Radio Signaling from Io for a Period of six Months", J. B. Scott, Tim Imholt and Jim Roberts, The Texas Science Teacher.
 
  81. "21.1 cm Emissions From the Sun During a Period of the Sun Spot Cycle", Tim Imholt and J. A. Roberts, Journal of the Society of Amateur Radio Astronomers (JSARA), 2002.
 
  82. "Sporadic E Propagation and the Sun Spot Cycle", Tim Imholt and Jim Roberts, Published in The Waterhole, a publication of SARA. (2002).
 
  83. "An intensity-expansion method to treat non-stationary times series: an application to the distance between prime numbers" (with N. Scafetta, I. Imholt and B. J. West) Chaos Solitons and Fractals, 20, 119-125 (2004).
 
  84. "Nanotubes in Microwave Fields:  Light Emission, Intense Heat, Outgassing and Reconstruction", (with T. Imholt, C. A. Dykes, B. Hasslacher, J. M. Perez, D. W. Price, J. B. Scott, A. Wadhawan, Z. Ye and J. M. Tour), Chemistry of Materials (2003).
 
  85. "Significance of Microwaves in the Environment (An Extended Study)", with Dr. J. A. Roberts of the University of North Texas, proceedings of the National Educators' Workshop, Hampton, VA, October 2003.
 
  86. "Role of Microwaves in the Environment and Nanotechnology", with J. N. Dahiya, Proceedings of the Ninetieth Session of the Indian Science Congress, Section of Physical Sciences, Bangalore, India, p. 243, January 3 -7, 2003.
 
  87. "Microwave Absorption in Liquid Crystals and Carbon Nanotubes", Proc. of  the International Symposium on Microwave and Optical Technology, Ostrava, Czech Republic, August 11-16, 2003, with J. M. Tour and D.W. Price (Rice University).
 
  88. "Distribution of Electromagnetic Energy in a Microwave Oven Part II", NASA Conference Publication: NASA/CP-2003-212403, p. 83, 2003, with J. N. Dahiya and Aman Anand.
 
  89. "Microwave Absorption in Liquid Crystals and Carbon Nanotubes", submitted for publication for SPIE Publication (accepted). Co-Authors: J. N. Dahiya, J. M. Tour and D. W. Price (Rice University).
 
  90. "Solar Turbulence in Earth's Global and Regional Temperature Anomalies", Nicola Scafetta, Paolo Grigolini, Timothy Imholt, Jim Roberts and Bruce J. West, Phys. Rev. E 68, o26303 (2004).
 
  91. "The Role of Metallic Impurities in the Interaction of Carbon Nanotubes with Microwave  Radiation", F. Naab, M. Dhoubhadel, O. W. Holland, J. L. Duggan, J. Roberts and F. D. McDaniel.  Proceedings of the 10th International Conference on Particle Induced X-ray Emission and its Analytical Applications", 4, (2005)  Meeting held at Portoroz, Slovenia ,  June 4-8, 2004.
 
  92. "Electromagnetic Wave Properties of Polymer Blends of Single Wall Carbon Nanotubes Using a Resonant Microwave Cavity as a Probe", J. Roberts, T. Imholt, Z. Ye, C. A. Dykes, D. W. Price, Jr, and J. M. Tour.  J. Appl. Phys.  95, 4352-4356, April (2004).
 
  93. "Select Gas Absorption in Carbon Nanotubes Loading a Resonant Cavity to Sense Airborne Toxins Gases", Aman Anand, James A. Roberts, F. Naab, Jai N Dahiya, O. W. Holland, Floyd D. McDaniel, Nuclear Instruments and Methods B (NIMB) Elsevier Publication, 241 (2005), 511-516.
 
  94. "Microwave Enhanced Polarization in Carbon Dioxide Molecule, submitted for publication to the Journal of Microwave Power and Electromagnetic Energy submitted summer 2005) (J. Dahiya,  J.  Roberts and A. Anand).
 
  95. "Select Gas Absorption In Carbon Nanotubes Loading A Microwave Resonant Cavity To Sense  Airborne Toxin Gases, the Physics of Semiconductor Devices", Vol. 1, pp 614-619, 2005. (J. Roberts, A. Anand and J. Dahiya).
 
  96. "Frequency and Temperature Dependent Studies of Nitrobenzene    Using a Computer Controlled Microwave Resonant Cavity", Proceedings of the Indian  Science Congress, Hyderabad, India,  January 3-7, 2006. (J. Dahiya, J. Roberts and  A. Anand).
 
  97. "Gallium Arsenide (GaAs) and Lead Zirconate Titanate (PZT)in a Microwave field", (J.  Dahiya, J. Roberts, F. McDaniel and  A. Anand) Proceedings of the 10th International Symposium on Microwave Technology and Optical Technology (ISMOT-2005)Fukuoka, Japan, August 22-25, 2005.
 
  98. "Effective Dielectric Constant of Photonic Crystal of Aligned Anisotropic Cylinders and the Optical Response of a Periodic Array of Carbon Nanotubes", E. Reyes, A. A. Krokhin and J. Roberts, Physical Review B 72, 15118-1-4 (2005).
 
  99. "A Model for Microwave Heating of Carbon Nanotubes" (with Z. Ye, W. D.Deering and A. Krokhin) (Physical Review B, 15) (2006).
 
  100. "Gallium Arsenide (GaAs) and Lead Zirconate Titanate in a Microwave Field", J.N. Dahiya, A. Anand, J.A. Roberts, F. McDaniel, International Journal of Microwave Power and Optical Technology, Vol.1 no 2 PP. 506-510(2006).
 
  101.

"Microwave Absorption by an Array of Carbon Nanotubes:  A Phenomenological Model", with Z. Ye, W. D. Deering, A. Krokhin and J. A. Roberts, Phys. Rev. B 74, (2006).
 
  102.

"Microwave Enhanced Polarization in CArbon Dioxide Molecule," J. N. Dahiya, A. Anand, and J. A. Roberts, Journal of Microwave Power and Electromagnetic Energy, Vol. 41, No. 2, PP. 1-8 (2007).
 
   

For more Information:

You may e-mail Dr. Roberts at roberts@unt.edu

Or send mail to

Department of Physics
P.O. Box 311427
University of North Texas Denton, Texas 76203-1427

(940) 565-3022

Last Updated 25-Feb-2008