Suppression of Background Emission from High Vibrational Levels in the Excited State through Vibronic Mixing in Supersonic Jet Spectrometry by Using Synchronous Scan Luminescence

Cheng Huang Lin, Totaro Imasaka, Nobuhiko Ishibashi

研究成果: 雜誌貢獻期刊論文同行評審

2 引文 斯高帕斯(Scopus)

摘要

When a sample molecule is excited to high vibrational levels in the excited state, rapid intramolecular relaxation occurs by an interaction with a dense manifold of vibrational levels in the ground state. Due to vibronic mixing, a combination of vibrational quanta is redistributed and the state is no longer identical with the initial state excited. Therefore, a complicated and broad-band structure appears in a conventional excitation spectrum, due to breakdown of selection rules. This common feature in supersonic jet spectrometry makes It difficult to assign a specific component even for a sample containing only a single interference compound. For example, selective detection of β-naphthol is difficult for a sample containing anthracene, and this situation is similar to m-toluidine and 2-methylnaphthalene. However, this unwanted photoemission is completely suppressed by a combination of supersonic Jet spectrometry and synchronous scan luminescence spectrometry monitoring resonance fluorescence (SSJ/R-SSL). Furthermore, the number of spectral lines is reduced, giving a simpler spectrum. Thus SSJ/R-SSL spectrometry provides a useful analytical means for selective analysis of organic molecules such as polycyclic aromatic hydrocarbons.

原文英語
頁(從 - 到)2346-2348
頁數3
期刊Analytical Chemistry
63
發行號20
DOIs
出版狀態已發佈 - 1991 十月 1
對外發佈

ASJC Scopus subject areas

  • 分析化學

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