Study of the lowest electronic states of Xe2, XeKr, and XeAr molecules by the method of multiphoton resonance ionization

Abstract

The spectra of Xe2, XeKr, and XeAr molecules in the range 66 500–68 800 cm−1 are obtained by the methods of (2 + n) and (3 + n) (n = 1, 2, 3) resonance multiphoton ionization during the registration of molecular and atomic ions. The combining of two-and three-photon resonance excitations of Xe2 molecules makes it possible to obtain the spectra caused by transitions from the ground state X0g+ to the excited states of Xe*6s[3/2]1,2oXe1S0 molecules both of the even (0g+, 1g) and of the odd (B0u+, B′1u, 2u) symmetries. The data on the Ω = 2u state of the Xe2 molecule with the dissociation limit Xe*6s[3/2]2o + Xe1S0 and on the Ω = 1 state of the XeAr molecule with the dissociation limit Xe*6s[3/2]1o + Ar1S0 are obtained for the first time. The potential curve of the excited 2u state of the Xe*6s[3/2]2o Xe1S0 molecule is repulsive and intersects the potential curve of the B0u+ state of the Xe*6s[3/2]1o Xe1S0 molecule. In the case of the three-photon excitation, it is observed that all the bands in the spectra of XeKr and XeAr molecules are broadened and are shifted, which indicates that, in an intense light field, the influence of the dynamic Stark effect is significant.