Journal article
Deexcitation dynamics of Rydberg states in O₂: I. Total cross sections for O I fluorescence emission following predissociation of 2σ⁻¹u (c⁴Σ⁻u)nσg ³Σ⁻u state



Publication Details
Authors:
Liebel, H.; Ehresmann, A.; Schmoranzer, H.; Demekhin, P.; Lagutin, B.; Sukhorukov, V.
Publication year:
2002
Journal:
Journal of Physics B: Atomic, Molecular and Optical Physics
Pages range:
895-905
Volume number:
35
ISSN:
0953-4075

Abstract
Absolute cross sections for the total fluorescence emission between 97 and 131nm by atomic oxygen formed after the photoexcitation of 2σ-1u(c4Σ-u)nσg3Σ-u Rydberg states in O2 and their successive predissociation were measured for the first time. The dissociation lifetimes and fluorescence yields were estimated using a stepwise model and the potential curve of the O2+ -1u(c4Σ-u) state known from Beebe et al (Beebe NHF, Thulstrup EW and Andersen A 1976 J. Chem. Phys. 64 2080). The calculated lifetimes of the vibrational levels v = 0 and 1 of the 2σ-1u(c4Σ-u) state are 3.4×10-12 and 6.3×10-14s, respectively. They agree with the measured data of Evans et al (Evans M, Stimson S, Ng CY and Hsu C-W 1998 J. Chem. Phys. 109 1285) and are consistent with the results of the present experiment. The calculated lifetimes support the model of `fast' dissociation of the O2+-1u(c4Σ-u), v states in contrast to the earlier model of `slow' dissociation of Tanaka and Yoshimine (Tanaka K and Yoshimine M 1979 J. Chem. Phys. 70 1626).


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