Lifetime measurements of theBthinsp;3Pgr;gstate of N2using laser excitation

摘要

A chopped cw dye laser has been used to excite selected levels of theBthinsp;3Pgr;gstate of N2in a molecular beam ofAthinsp;3Sgr;u+state metastables. Laserhyphen;induced fluorescence was observed from the vibrational levelsv=5 throughv=12, and a photomultiplier was used in conjunction with a microcomputer system to perform timehyphen;resolved detection of the decay light. The lifetimes have been measured to an accuracy of about 3percnt;. They show a smooth decline from 5.87 mgr;s forv=5 to 4.11 mgr;s forv=12. No dependence on rotational level was observed, and no contributions to theBstate decay were found from intrasystem cascading of the formBrarr;Wthinsp;3Dgr;urarr;Brarr;Athinsp;3Sgr;u+.