NaK分子D^1π态自发辐射寿命及其总碰撞猝灭截面的测量

Determination of the Spontanesous Lifetimes and Total Quenching Cross Sections of D￣1π(v',J') Levels of NaK in Collision with Ar Buffer Gas

本文通过脉冲染料激光５１４．５ｎｍ激发ＮａＫ分子，用时间分辨荧光法详细测量了Ｄ１π态有效辐射寿命随缓冲Ａｒ气压强的变化关系，利用Ｓｔｅｒｎ－Ｖｏｌｌｍｅｒ曲线外推得到了在Ｔ＝３４８℃时Ｎａｋ分子Ｄ＇π态（ｖ＇＝１，Ｊ＇＝６７；Ｖ＇＝１，Ｊ＇＝９５：Ｖ＇＝３，Ｊ＇＝１２２）的自发辐射寿命分别为１６．１ｎｓ，１５．１ｎｓ，１４．７ｎｓ。Ａｒ气对基碰撞猝灭截面分别为２．２８ｎｍ３，２．１２ｎｍ２和１．９５ｎｍ２。Ｎａｋ分子Ｄ＇π态自发辐射寿命以及Ａｒ气对Ｄ＇π态总碰撞猝灭截面的测量。

Time-resolved fluorescence was applied for obtaining the Stern-Vollmer plot, which showing the dependce of inverse effective lifetimes of some excited (v',J')levels in D1πstate of NaK on the pressures of Ar buffer gas. From Stern-Vollmer plot, we determined the spontanesous lifetimes for the levels D1π(v'=1, J'=67;V'=1,J'=95, V'=3, J'=122), of NaK to be 16.1, 15.1 and 14.7 nsec, and the total que nching cross sections for the corresponding D1πlevels during collision with Ar atom at T=348℃ to be 2.28, 2.12 and 1.95 nm2, respectively.