Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
82 (1985), S. 681-692
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Infrared (2–16 μm) emission from Ar Rydberg atoms, excited in a conventional low-pressure microwave discharge plasma, has been observed in the cryogenic COCHISE reactor/spectrometer facility. The observed spectrum is very complex but is identifiable using the detailed energy level structure and optical selection rules for ArI. Detailed transition probabilities for dipole-allowed transitions between 2 and 16 μm were computed using the Coulomb approximation. Comparisons of observed and predicted spectra show that substantial long wavelength infrared (LWIR) emission (∼12 μm) arises from Rydberg states near the ionization limit; these states must have kinetically enhanced populations in order to account for the observed emission intensities. The results are interpreted in terms of a radiative/collisional cascade sequence initiated by dissociative recombination of Ar+2 with energetic electrons in the active discharge.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.448545
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