These publications in peer-reviewed journals reflect the work I did with my graduate students and selected undergraduates between 1965 and 1982 while I was on the staff in chemistry at the University of Wisconsin in Madison, WI. They generally address the fundamental nature of spark discharge as a process of spectrochemical utility, although some present instrumentation we developed to form and observe the spark. The first three reflect my Ph.D. work done between 1960 and 1964 at the University of Illinois under the direction of Professor Howard V. Malmstadt.

1. J. P. Walters and H.V. Malmstadt, "Emission Characteristics and Sensitivity in a High-Voltage Spark Discharge", Anal. Chem., 37, 1484 (1965).

2. J. P. Walters and H. V. Malmstadt, "Oscilloscopic Characterization of an Electronically-Ignited Spark Source", Appl. Spectry., 20, 80 (1966).

3. J. P. Walters and H. V. Malmstadt, "Derivative Scanning for Wavelength Identification", Appl. Spectry., 20, 196 (1966).

4. J. P. Walters, "A Plane-Grating Time-Resolved Spectrometer for Basic and Analytical Emission Spectrometry", Anal. Chem., 39, 770 (1967).

5. J. P. Walters, "Short-Time Electrode Processes and Spectra in a High Voltage Spark Discharge", Anal. Chem, 40, 1540 (1968)

6. J. P. Walters, "An Adjustable-Waveform High Voltage Spark Source for Optical Emission Spectrometry", Anal. Chem., 40, 1672 (1968).

7. J. P. Walters, "Historical Advances in Spark Emission Spectroscopy", Appl. Spectry., 23, 317 (1969). Received the 1969 Meggers Award as the outstanding paper published in volume 23 of Applied Spectroscopy.

8. J. P. Walters, "Short-Term Phenomena at the Electrodes in Spark Discharges", Bunko Kenkyu (J. Spec. Soc., Japan), 17, 133 (1968) (in Japanese).

9. J. P. Walters and T. V. Bruhns, "Electronically Controlled, Current Injection Spark Source for Basic and Applied Emission Spectrometry", Anal. Chem., 41, 1990 (1969).

10. S. W. Brewer, Jr. and J. P. Walters, "Optical and X-Ray Studies of Metal Surfaces Eroded by High-Voltage Spark Discharge", Anal.Chem., 42, 1980 (1969).

11. R. D. Sacks and J. P. Walters, "Short-Time, Spatially-Resolved Radiation Processes in High-Voltage Spark Discharge", Anal. Chem., 42, 61 (1970).

12. J. P. Walters, "Source Parameters and Excitation in a Spark Discharge", Appl. Spectry., 26, 17 (1972).

13. J. P. Walters, "The Formation and Growth of a Stable Spark Discharge", Feature Article, Appl. Spectry., 26, 323 (1972).

14. J. P. Walters and S. A. Goldstein, "How and What to Sample in the Analytical Gap", A.S.T.M. Spec. Tech. Publ. No. 540 on "Sampling, Standards, and Homogeneity", Amer. Soc. Test. and Mater., Phila, Pa., page 45 (1973).

15. S. A. Goldstein and J. P. Walters, "Review of Considerations for High-Fidelity Imaging of Laboratory Spectroscopic Sources - Part I", Spectrochim. Acta, 31B, 201 (1976).

16. S. A. Goldstein and J. P. Walters, "Review of Considerations for High-Fidelity Imaging of Laboratory Spectroscopic Sources - Part II", Spectrochim. Acta, 31B, 295 (1976).

17. J. P. Walters, B. D. Hollar, and D. M. Coleman, "Simple Bearing for High- Precision Grating Rotation", Anal. Chem., 48, 1261 (1976).

18. Alexander Scheeline and J. P. Walters, "Considerations for Implementing Spatially-Resolved Spectroscopy Using the Abel Inversion", Anal. Chem., 48, 1519 (1976).

19. D. M. Coleman, and J. P. Walters, "An Electronic Adjustable-Waveform Spark Source for Basic and Applied Emission Spectrometry", Spectrochim. Acta, 31B, 295 (1976).

20. D. M. Coleman and J. P. Walters, "Simple Adjustable Mounting for High Precision Optical Rails", Appl. Spectry., 31, 172 (1977).

21. Robert L. Watters, Jr. and J. P. Walters, "Device for Stroboscopic Extraction of Atmospheric Pressure Species into Regions of High Vacuum", Rev. Sci. Instr., 48, 643 (1977).

22. J. P. Walters, "Modifications of Traditional Spark Sources to Produce Adjustable Current Waveforms", Appl. Spectry., 31, 36 (1977).

23. John R. Rentner, T. Uchida, and J. P. Walters, "A 323 MHz Quarter-Wave Spark Source for the Production of Stable Spark Discharges", Spectrochim. Acta, 32B, 125 (1977).

24. J. W. Hosch and J. P. Walters, "High Spatial Resolution Schlieren Photography", Appl. Optics, 16, 473 (1977).

25. David M. Coleman and J. P. Walters, "Evidence of an Ionic, Toroidal, Post Discharge Environment in the Atmospheric Pressure Spark Discharge", J. Appl. Phys, 48, 3297 (1977).

26. G. Beenan, J. R. Rentner, and J. P. Walters, "A Digitally-Controlled Shutter System for Spectroscopy", Appl. Spectry., 31, 693 (1977).

27. Alexander Scheeline and John P. Walters, "Algorithms for Modeling and Processing Spatial Information in Plasma Discharges", Analyt. Chim. Acta, Computer Techniques and Optimization, 1, 23 (1977).

28. J. P. Walters, "Spark Discharge: Application to Multi-Element Spectro-chemical Analysis", Science, 198, 787 (1977).

29. David M. Coleman, Robert L. Watters, Jr., and John P. Walters, "An Integrated Electronic Spark Source for Basic and Analytical Emission Spectroscopy", Spectrochim. Acta, 32B, 287 (1977).

30. R. J. Klueppel, D. M. Coleman, W. S. Eaton, S. A. Goldstein, R. D. Sacks, and J. P. Walters, "A Spectrometer for Time-Gated, Spatially-Resolved Study of Repetitive Electrical Discharges", Spectrochim. Acta, 33B, 1 (1978).

31. David M. Coleman and John P. Walters, "Design of a Large, Rigid, Modular Optical Bed for Versatile Optical and Spectroscopic Experimentation", Spectrochim. Acta, 33B, 127 (1978). (Publications 19, 30, and 31 collectively received the First Annual Lester W. Strock Award in 1980.)

32. Alexander Scheeline, David M. Coleman, and John P. Walters, "Measurement Procedures for Characterization of High-Voltage Spark Sources", Appl. Spectry., 32, 215 (1978).

33. Alexander Scheeline, R. J. Klueppel, David M. Coleman, and John P. Walters, "Computational Procedures for Characterization of High-Voltage Spark Sources", Appl. Spectry., 32, 244 (1978).

34. R. J. Klueppel, D. M. Coleman, J. W. Hosch, and J. P. Walters, "Structures Detected in a Stable, High-Voltage Spark Discharge by Time-Resolved Schlieren Spectroscopy", Spectrochim. Acta, 33B, 478 (1978).

35. John P. Walters, "A Synergic Approach to Graduate Research in Spectroscopy and Spectrochemical Analysis", in Contemporary Topics in Analytical and Clinical Chemistry, D. M. Hercules, G. M. Hieftje, L. R. Snyder, and M. A. Evenson, Eds., Vol. 3, pp 41-151, Plenum Press, New York (1978).

36. Alexander Scheeline and John P. Walters, "Use of a Roll Film Back for Photographic Spectral Detection", Appl. Spectry., 32, 566 (1979).

37. Alexander Scheeline, Jimmy W. Hosch, David M. Coleman, and John P. Walters, "Versatile Mirror Mount for Stable Optical Instrumentation", Appl. Spectry., 33, 253 (1979).

38. Alexander Scheeline and John P. Walters, "Spatially Resolved Spectroscopy: Theory and Problems Related to the Abel Inversion", in Contemporary Topics in Analytical and Clinical Chemistry, D. M. Hercules, G. M. Hieftje, L. R. Snyder, and M. A. evenson, Eds., Vol 4, Chap. 8, pp 295 - 372, Plenum Press, New York (1982).

39. Alexander Scheeline and John P. Walters, "Investigation of Bipolar Oscillatory Spark Discharges", Appl. Spectry., 33, 150 (1979). Received the 1979 William F. Meggers Award for the outstanding paper published in Vol. 33 of Applied Spectroscopy.

40. Book Review of "Use of the Chemical Literature: An Introduction to Chemical Information Retrieval" by Samuel H. Wilen; American Chemical Society, Wash., DC, 1978. Reviewed by John P. Walters and David E. Tylec, Anal. Chem., 51, 1233A (1979).

41. Thomas J. Olscheske and John P. Walters, "Adaptation of an Interactive Discharge Simulation Program to a Disc Supported Microcomputer", Appl. Spectry., 33, 463 (1979).

42. Tsutomu Araki and John P. Walters, "An Electronic, Adjustable Waveform Current Generator for Use with a Quarter-Wave Resonant Spark Source", Appl. Spectry., 33, 463 (1979).

43. Tsutomu Araki and John P. Walters, "Ionic and Atomic Absorption in Stable Spark Discharges", Spectrochim. Acta, 34B, 371 (1979).

44. Tsutomu Araki, John P. Walters, and Shigeo Minami, "Burst Radio Frequency Excited Pulsed Hollow Cathode Lamp", Appl. Spectry., 34, 33 (1980).

45. Paul B. Farnsworth and John P. Walters, "A Translation of the Classic Paper by H. Kaiser and A. Wallraff on Spark Discharge", Spectrochim. Acta, 35B, 315 (1980).

46. R. J. Klueppel and John P. Walters, "Observations on the Formation of Spark Discharge and Its Influence by an External Magnetic Field", Spectrochim. Acta, 35B, 431 (1980).

47. S. E. Mathews, Thomas M. Niemczyk, and John P. Walters, "A Schlieren System for Time and Space Resolved Photography of Self-Luminous Electrical Discharges", Appl. Spectry., 34, 200 (1980).

48. Alexander Scheeline, J. C. Travis, J. R. DeVoe, and John P. Walters, "Discovery of an Electrical Post-Pulse in the Surroundings of a High-Voltage Spark Discharge", Spectrochim. Acta, 36B, 153 (1981).

49. Alexander Scheeline, John A. Norris, J. C. Travis, J. R. DeVoe, and John P. Walters, "Particulates Formed by a Stabilized High-Voltage Spark Discharge", Spectrochim. Acta, 36B, 373 (1981).

50. Steven G. Barnhart, Paul B. Farnsworth, and John P. Walters, "Integrated, Microcomputer-Controlled, Adjustable-Waveform Spark Source for Atomic Emission Spectrometry", Anal. Chem., 53, 1432 (1981).

51. David Ekimoff and John P. Walters, "Emission and Electrode Erosion Properties of a Positionally Stable Spark Discharge Train", Anal. Chem., 53, 1644 (1981).

52. Paul B. Farnsworth and John P. Walters, "An Instrumental System for Multidimensional Spectroscopic Characterization of an RF-Boosted, Pulsed Hollow Cathode Lamp", Anal. Chem., 54, 885 (1982).

53. Paul B. Farnsworth and John P. Walters, "Excitation Processes in an R-F Boosted Hollow Cathode Lamp", Spectrochim. Acta, 37B, 773 (1982).

54. D. Neil Washburn and John P. Walters, "Developments for High-Speed Analysis of Diverse Ferrous Alloys", Appl. Spectry., 36, 510 (1982).

55. John W. Olesik and John P. Walters, "Statistical Mapping of Alloy Samples by Spark, Excited Optical Emission Spectrometry", Applied Spectroscopy, 37, 105 (1983).

56. John W. Olesik and John P. Walters, "Characterization and Use of the Silicon Intensified Target Vidicon Detector in Basic and Applied Research in Atomic Spectroscopy", Appl. Spectry., 38, 578, (1984).

57. Samuel E. Mathews, David Ekimoff, and John P. Walters, "Computer Control of Basic and Applied Experiments in Spark Emission Spectroscopy", Appl. Spectry., 36, 111 (1982).

58. John P. Walters and W.S. Eaton, "Spatial Discrimination in Spark Emission Spectrochemical Analysis", Anal. Chem., 55, 57 (1983).

59. Steven G. Barnhart and John P. Walters, "Fiber Optic Signal Transmission to Reduce Radio Frequency Interference from a High-Voltage Spark Discharge", Appl. Spectry., 37, 537 (1983).

60. John W. Olesik and John P. Walters, "The Silicon-Intensified Target Vidicon Detector - Operation, Characterization, and Application in Atomic Spectroscopy Research", ACS Symposium Series 236, MULTI-CHANNEL IMAGE DETECTORS, V 2, p 31 (1983).

61. Deborah J. C. Helmer and J. P. Walters, "Analysis of the Effluent from a High Voltage Spark Discharge with a Microwave-Induced Plasma", Appl. Spectry., 38, 392 (1984).

62. Deborah J. C. Helmer and J. P. Walters, "Microscopic Investigations of the Material Eroded by a High Voltage Spark Discharge", Appl. Spectry., 38, 399 (1984).

63. John P. Walters and S. A. Goldstein, "Emission Topography of a Stable Spark Discharge Train", Spectrochim. Acta, 39B, 693 (1984).

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