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Optical–Optical Double Resonance Spectroscopy of the 1g(3P1)-A3Π (1u)-X1Σg+ Transition of I2

✍ Scribed by Eriko Kagi; Nobuyuki Yamamoto; Hisashi Fujiwara; Masaru Fukushima; Takashi Ishiwata

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
106 KB
Volume
216
Category
Article
ISSN
0022-2852

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✦ Synopsis

Optical-optical double resonance spectroscopy was used to study the 1 g ( 3 P 1 ) ion-pair state of I 2 correlating to I -( 1 S) + I + ( 3 P 1 ) at the dissociation limit. We gained access to the 1 g ( 3 P 1 ) state though the A 3 (1 u ) state in the (1 + 1) photon-excitation scheme. The pump laser excited the A 3 (1 u )-X 1 + g transition at a fixed frequency for state selection. The probe laser was scanned to detect the 1 g ( 3 P 1 )-A 3 (1 u ) resonance by monitoring the ultraviolet emission from the 1 g ( 3 P 1 ) state at 278 nm. The 1 g ( 3 P 1 ) state was observed in a vibrational progression consisting of P and R doublets. An energy level analysis was carried out for the 1 g ( 3 P 1 ) state in the 0 ≤ v ≤ 14 and 12 ≤ J ≤ 135 range, which led to a set of molecular parameters including the -doubling constant. The -doubling of the 1 g ( 3 P 1 ) state was discussed by the pure precession model and interpreted to occur through the heterogeneous coupling with the 0 - g ( 3 P 1 ) state correlating to the same ionic asymptote.

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