Abstract

The excited state dynamics of $o$-dichlorobenzene has been studied by femtosecond time-resolved photoelectron imaging. The lifetime of the first excited state ${S}_{1}$ of $o$-dichlorobenzene was determined to be 482 \ifmmode\pm\else\textpm\fi{} 10 ps. Field-free nonadiabatic alignment of the $o$-dichlorobenzene on the first excited state ${S}_{1}$ (with an asymmetry parameter k $=$ 0.153) by a femtosecond laser pulse was observed via time-resolved photoelectron angular distributions. Rotational wave packet revivals on the ${S}_{1}$ state of the typical asymmetric molecule $o$-dichlorobenzene at 296 ps has been measured.

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