Picosecond pulse radiolysis of rare gases: Evidence for the time evolution of the subexcitation spectrum
- Argonne National Lab., IL (USA)
The production of the 2p electronic excited states of the pure rare gases neon, argon, krypton, and xenon has been studied by using picosecond pulse radiolysis techniques. At pressures below about 5 Torr, the emission from these excited states shows a pressure-dependent growth-decay pattern. Kinetic analysis of these patterns reveals formation rate constants that are all greater than 10{sup 12} dm{sup 3} mol{sup {minus}1} s{sup {minus}1} (1.66 {times} 10{sup {minus}9} cm{sup 3} s{sup {minus}1}). These observations preclude atom-atom collisional processes and support an excitation mechanism involving collisional energy loss from electrons with energies greater than the lowest excitation potential of the rare gas. It is thus concluded that the secondary electron spectrum in pure rare gases at pressures below a few Torr takes a few nanoseconds to degrade to energies below that of the lowest excited state. This time scale therefore (by definition) corresponds to the time needed to form subexcitation electrons. In 1 atm of rare gas the time taken would be of the order of 20-30 ps.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5114932
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:5; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400600* -- Radiation Chemistry
ARGON
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
GASES
HELIUM
INFORMATION
IRRADIATION
KINETICS
KRYPTON
NEON
NONMETALS
NUMERICAL DATA
PRESSURE DEPENDENCE
PULSED IRRADIATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
RARE GASES
REACTION KINETICS
TIME DEPENDENCE
XENON