ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Rotationally resolved transitions from the metastable 4sσ a3Σ+u state of Ar2 to the 7pσ 3Σ+g state have been observed by laser excitation spectroscopy in a pulsed corona discharge. Laser induced fluorescence spectra for the 7pσ 3Σ+g←a3Σ+u transition observed near 19 530 cm−1 have led to the first resolved triplet splittings and rotational analyses for Rydberg–Rydberg transitions in Ar2. Analyses for the (0–0), (0–1), (1–0), and (1–1) bands of 7pσ←a are presented here. Bands with v'=2 are observed for this system but exhibit no rotational structure and bands with v'(approximately-greater-than)2 are not observed, indicating that the predissociation lifetimes of these upper levels fall rapidly for v'(approximately-greater-than)1. Data presented lead to rotational energies and molecular constants for the a3Σ+u and 7pσ 3Σ+g states, including the effective rotational constant Be which is determined to be 0.1412 cm−1 and 0.1345 cm−1 for the 4sσ a3Σ+u and 7pσ 3Σ+g states, respectively. Results are compared to ab initio and other calculations, and combined with existing data to produce experimental estimates of D0 and De for the a3Σ+u state of 5700±200 cm−1 and 5850±200 cm−1, respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.467443
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