Excited Atomic and Molecular States in Liquid Helium

  • W. A. Fitzsimmons


The microscopic structure of dense gases and liquids and the nature of excited atomic and molecular states in dense media has been a subject of long standing scientific interest. For example the fluorescence of certain compounds when exposed to sun light has been known for hundreds of years, and very similar substances are important today as the active chemicals in modern dye lasers. The investigation into the chemistry of dense systems is an active area of research where many methods of initial excitation are used such as u.v. light, γ rays, α and β particle bombardment, mechanical shock, heat, etc. The first several spin singlet and spin triplet electronic energy levels of a complex molecule in a room temperature liquid can be thought of in terms of the diagram shown in Fig. 1.


Liquid Helium Molecular State Excite Atomic Energy Level Diagram Superfluid Helium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1).
    Isadore B. Ber Iman, Handbook of Fluorescence Spectra of Aromatic Molecules (Academic Press, New York, 1971), 2nd Ed.Google Scholar
  2. 2).
    Benjamin B. Snavely, Proceedings of the IEEE 57, 1374 (1969).CrossRefGoogle Scholar
  3. 3).
    W. S. Dennis, E. Durbin, Jr., W. A. Fitzsimmons, 0. Heybey, and G. K. Walters, Phys. Rev. Letters 23, 1083 (1969).ADSCrossRefGoogle Scholar
  4. 4).
    M. Stockton, J. W. Keto, and W. A. Fitzsimmons, Phys. Rev. 5, 372 (1971) and Phys. Rev. Letters 24, 654 (1970). See also C. M. Surko, R. E. Packard, G. J. Dick, and F. Reif, Phys. Rev. Letters 24, 657 (1970).ADSGoogle Scholar
  5. 5).
    J. C. Hill, 0. Heybey, and G. K. Walters, Phys. Rev. Letters 26, 1213 (1971).ADSCrossRefGoogle Scholar
  6. 6).
    A. P. Hickman and Neal F. Lane, Phys. Rev. Letters 26, 1216 (1971).ADSCrossRefGoogle Scholar
  7. 7).
    J. A. Hornbeck and J. P. Molnar, Phys. Rev. 84, 621 (1951).ADSCrossRefGoogle Scholar
  8. 8).
    A. P. Hickman and Neal F. Lane, private communication.Google Scholar
  9. 9).
    J. W. Keto, M. Stockton and W. A. Fitzsimmons, Phys. Rev. Letters 28, 792 (1972).ADSCrossRefGoogle Scholar
  10. 10).
    J. Wilks, The Properties of Liquid and Solid Helium ( Oxford U.P., London, 1967 ).Google Scholar
  11. 11).
    M. L. Ginter and R. Battino, J. Chem. Phys. 52, 4469 (1970).ADSCrossRefGoogle Scholar
  12. 12).
    Y. Tanaka and K. Yoshino, J. Chem. Phys. 39, 3081 (1963).ADSCrossRefGoogle Scholar
  13. 13).
    K. M. Sando, Mol. Phys. 21, 439 (1971).ADSCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1973

Authors and Affiliations

  • W. A. Fitzsimmons
    • 1
  1. 1.Physics DepartmentUniversity of WisconsinMadisonUSA

Personalised recommendations