OCS分子的共振多光子电离光谱

RESONANCE ENHANCE MULTIPHOTON IONIZATION SPECTRA OF OCS MOLECULE IN THE 277—285 nm WAVELENGTH REGION

OCS分子的真空紫外吸收光谱早有研究,但有关OCS分子的多光子电离光谱尚未见报导。我们利用可调脉冲激光器,研究了OCS分子的共振多光子电离光谱。首次观察到OCS分子在277—285nm波长范围内的多光子电离光谱。OCS由硫氰酸铵和硫酸反应制取,经多次低温蒸馏纯化。

The first observation of the REMPI spectra of OCS molecule in the region of 277—285nm is reported. The laser source is the pulse laser of Nd:YAG pumped tunable dye laser. The total ionization electric charges of OCS gas in the static cell is collected with the parallel electrodes connected to a boxcar averager. The power dependence shows the REMPI is resulted from the two photon resonant,three photon ionization. Comparing with the VUV absorption spectra, the main spectral lines in the REMPI spectra has been assigned preliminarily. The abnormal spectral line at 279.07nm may be due to the MPI of oxygen atom produced from the photodissociation of OCS molecules.