2C-R4WM spectroscopy of jet cooled NO3 (II)

Fukushima, Masaru

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https://hdl.handle.net/2142/100741 Copy

Description

Title

2C-R4WM spectroscopy of jet cooled NO3 (II)

Author(s)

Fukushima, Masaru

Contributor(s)

Ishiwata, Takashi

Issue Date

2018-06-20

Keyword(s)

Radicals

Abstract

We have generated NO3 in a supersonic free jet expansion, and observed laser induced fluorescence ( LIF ) and twocolor resonant four-wave mixing ( 2C-R4WM ) signals. We have measured dispersed fluorescence ( DF ) spectra from single vibronic levels. Among the vibrational levels observed in the DF spectrum from the vibration-less level, the ν1 and ν3 fundamental regions ( ∼1050 and ∼1500 cm−1 regions, respectively ) are now active for discussion, and thus we have tried to measure the rotationally resolved 2C-R4WM spectraa . The 2C-R4WM spectrum of the ν3 fundamental region is consistent with a previous infra-red investigationb , and that of ν1 leads to the identification of the K = 0 and N = 1 level of the ν1 fundamental for the first time. We have found an additional level near ν1 c , and the 2C-R4WM spectrum of the level shows two rotational transitions separated by 0.27 cm−1 . Although the 0.27 cm−1 separation is about 10 times larger than the spin splitting, ∼0.025 cm−1 , of the K = 0 and N = 1 levels at the other a 0 1 levels with l = 0, such as vibration-less and ν1 ( the latter value of which, 0.025 cm−1 , cannot be resolved under our instrumental resolution ), the two transitions are thought to correspond to those terminating to spin sub-levels, J = 0.5 and = 1.5, at the present. We have assigned the additional level to 3ν4 (a 0 1 ) with l = ±3. For Σ vibronic levels with K = 0, such as vd = 1 and l = 1, of a 2Π electronic state, it is well known that 2Σ (+) and 2Σ (−) vibronic levels have relatively large Ω- or ρ-type doubling due to non-zero Λ, in spite of the Σ vibronic levelsd . It is thought that the unexpectedly large spin splitting, 0.27 cm−1 , is induced by spin-vibration interaction, which has been discussed for degenerate vibronic levels of non-degenerate electronic states, 2Σ and 3Σ, of linear polyatomic moleculese.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100741

DOI

10.15278/isms.2018.WD02

Copyright and License Information

Copyright 2018 Masaru Fukushima

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