Picosecond investigation of the collisional deactivation of OH A 2Σ+(v′ = 1, N′ = 4, 12) in an atmospheric-pressure flame

被引：30

作者：

Beaud, P ^{[1
]}

Radi, PP ^{[1
]}

Franzke, D ^{[1
]}

Frey, HM ^{[1
]}

Mischler, B ^{[1
]}

Tzannis, AP ^{[1
]}

Gerber, T ^{[1
]}

机构：

[1] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

来源：

APPLIED OPTICS | 1998年 / 37卷 / 15期

关键词：

D O I：

10.1364/AO.37.003354

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The collisional deactivation of the laser excited states A (2) Sigma(+) (upsilon' = 1, N' = 4, 12) of OH in a flame is studied by measurement of spectrally resolved fluorescence decays in the picosecond time domain. Quenching and depolarization rates, as well as vibrational energy-transfer (VET) and rotational energy-transfer (RET) rates are determined. An empirical model describes the temporal evolution of the quenching and VET rates that emerge from the rotational-state relaxation. Fitting this model to the measured 1-0 and 0-0 fluorescence decays yields the quenching and VET rates of the initially excited rotational state along with those that correspond to a ratationally equilibrated vibronic-state population. VET from the higher rotational state (N' = 12) shows a tendency for resonant transitions to energetic close-lying levels, RET is investigated by analysis of the temporal evolution of the 1-1 emission band. The observed RET is well described by the energy-corrected sudden-approximation theory in conjunction with a power-gap law. (C) 1998 Optical Society of America.

引用

页码：3354 / 3367

页数：14

共 53 条

[1] ROTATIONALLY INELASTIC-COLLISIONS BETWEEN A DIATOMIC MOLECULE IN A 2-SIGMA(+) ELECTRONIC STATE AND A STRUCTURELESS TARGET [J].