Quenching of NO2 Fluorescence
Quenching of NO2 Fluorescence
复制标题
NO2 荧光的猝灭
DOI：
10.1063/1.1726751
复制
发表时间：
1966
影响因子：
4.4
通讯作者：
F. Kaufman
中科院分区：
文献类型：
--
作者：
G. Myers;D. Silver;F. Kaufman
得到了13种不同惰性气体对NO2荧光的猝灭常数。淬火截面为气体动力学的1/25 ~ 1/2，随着分子复杂性和偶极矩的增加而增大。基态NO2猝灭未发现异常共振效应。目前的数据与激发NO2的单辐射寿命4.4×10−5秒一致。表观Stern-Volmer猝灭比是激发频率和荧光频率的函数，荧光光谱在高猝灭压力下呈现相应的红移。这表明淬火是一个多步骤的过程，尽管定性考虑表明NO2*的大部分多余内能可能在一次有效碰撞中转移。
Quenching constants for NO2 fluorescence were obtained for 13 different inert gases. Quenching cross sections range from 1/25 to 1/2 of gas kinetic and increase with increasing molecular complexity, and dipole moment. No unusual resonance effect for quenching by ground‐state NO2 was found. The present data are consistent with a single radiative lifetime of 4.4×10−5 sec for excited NO2. The apparent Stern—Volmer quenching ratios are shown to be functions of both the excitation and fluorescence frequency, and the fluorescence spectrum shows the corresponding red shift at high quenching pressure. This indicates that quenching is a multistep process, although qualitative considerations suggest that a large fraction of the excess internal energy of NO2* is likely to be transferred in a single effective collision.