激光诱导荧光研究与碘氧化物自由基的物理性质有关。

A laser induced fluorescence study relating to physical properties of the iodine monoxide radical.

机构信息

School of Chemistry, University of Leeds, Leeds, UKLS2 9JT.

出版信息

Phys Chem Chem Phys. 2010 Jan 28;12(4):823-34. doi: 10.1039/b910571a. Epub 2009 Nov 24.

PMID:20066367

Abstract

The dispersed fluorescence spectra originating from the v' = 2 and v' = 0 levels of the A(2)Pi(3/2) state of iodine monoxide (IO) have been recorded for the first time after laser induced fluorescence (LIF) excitation in the A(2)Pi(3/2)<-- X(2)Pi(3/2) electronic transition. The results are used to obtain relative Franck-Condon factors for various v'-->v'' transitions in the A(2)Pi(3/2)--> X(2)Pi(3/2) system up to v'' = 12 and compared with theoretical predictions. A fluorescence quenching study of the A(2)Pi(3/2) state of IO has also been performed, revealing that collisional quenching and rotational energy transfer (RET) are rapid in the A(2)Pi(3/2) state of IO. The J'-dependence to fluorescence quenching of the A(2)Pi(3/2) (v' = 2) state of IO by N(2) suggests a collisional predissociation mechanism.

摘要

碘氧化物（IO）的 A(2)Pi(3/2) 态的 v' = 2 和 v' = 0 能级的分散荧光光谱在激光诱导荧光（LIF）激发后首次被记录下来。这些结果用于获得 A(2)Pi(3/2)--> X(2)Pi(3/2) 系统中各种 v'-->v''跃迁的相对 Franck-Condon 因子，直到 v'' = 12，并与理论预测进行比较。还对 IO 的 A(2)Pi(3/2)态的荧光猝灭进行了研究，结果表明 IO 的 A(2)Pi(3/2)态的碰撞猝灭和转动能量转移（RET）非常快。N(2)对 IO 的 A(2)Pi(3/2)（v' = 2）态荧光猝灭的 J'-依赖性表明存在碰撞预解离机制。