TITLE

Laser induced fluorescence spectra of the D [sup 1]∑[sub u][sup +]→B[sup ′] [sup 1]∑[sub g][sup +] and C [sup 1]Π[sub g]→A [sup 1]∏[sub u] systems of C[sub 2] in solid Ne

AUTHOR(S)
Wakabayashi, Tomonari; Ong, Aik-Loong; Kra¨tschmer, Wolfgang
PUB. DATE
April 2002
SOURCE
Journal of Chemical Physics;4/8/2002, Vol. 116 Issue 14, p5996
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In our study of carbon vapor molecules trapped in Ne matrices at 6 K, we observed laser induced fluorescence spectra of the D ¹Σ[sup +,sub u]→B' ¹[sup +,sub g] system of C[sub 2] upon excitation of the Mulliken transition D Σ[sup +,sub u]←X ¹Σ[sup +, sub g] of C[sub 2] at 232 nm. A vibrational progression was clearly observed going from the upper vibrational ν' = 0 level of the electronic D state into several lower ν' = 0 - 6 levels of the B' state. We found that the progression spans from 359 to 517 nm with a large Franck-Condon shift showing the intensity maximum for the 0-2 or 0-3 transition. The vibrational constants for the B' state were derived as ω[sub e] = 1427 cm[sup -1] and ω[sub e]χ[sub e] = 2.1 cm[sup -1]. We also observed the C→A and the Swan band emissions, showing that from the excited D state also additional states were populated by internal conversion and intersystem crossing. The constants for the A state were derived as ω[sub e] = 1613.5 cm[sup -1] and ω[sub e]χ[sub e] = 18.5 cm[sup -1]. Fluorescence excitation spectra of the D →B' vibronic transitions were found to reproduce well the relatively narrow absorption feature of the Mulliken D←X system. We discuss the entirely different excitation spectra occurring in argon matrices in terms of matrix-site effects. Each vibronic band of the D→B' progression shows fine structures probably due to translations and librations of C[sub 2] molecules coupled with the surrounding lattice of Ne atoms. In our study of carbon vapor molecules trapped in Ne matrices at 6 K, we observed laser induced fluorescence spectra of the D ¹Σ[sup +,sub u]→B' ¹[sup +,sub g] system of C[sub 2] upon excitation of the Mulliken transition D Σ[sup +,sub u]←X ¹Σ[sup +, sub g] of C[sub 2] at 232 nm. A vibrational progression was clearly observed going from the upper vibrational ν' = 0...
ACCESSION #
6407986

 

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