用双光子吸收研究Na_26~1∑_g^+态的预离解

A Study of the Predissociation of Na_2 Molecules in the 6~1Σ_g^+ State by Two-photon Absorption

研究了 Na_26′∑_g^+态的预离解,Na 蒸汽被 Ar^+激光器泵浦的染料激光激发,通过双光子吸收使6°∑_g^+态得到布居,记录吸收线的宽度,分别测量 Na 3D→3P,5S→3P,4D→3P 跃迁的谱线强度与分子谱线的强度比,得到了6′∑_g^+态的预离解率。

Predissociation of a high-lying 6~1∑_g^+ state of Na_2 is studied.Na vapor is irradiated from a Ar^+ laser pumped dye laser, populating 6~1∑_g^+ state by two-photun absorption.The predissociation is monitored by the atomic sodium emission on the Na 3D→3P,5S→ 3P and 4D→3P transitions.By combining ratios of atomic to molecular fluorescence,the absolute predissociation rate of 6~1∑_g^+ level is directly measured from the line width recorded on the laser excitation scan.