Theoretical study on isotope-selective rotational excitation of the LiCl molecule by an optical frequency comb

Ichihara, Akira ; Matsuoka, Leo; Kurosaki, Yuzuru; Yokoyama, Keiichi  

Rotational transition probabilities were calculated using the close-coupling method in order to explore the possibility of isotope-selective rotational excitation of LiCl by an optical frequency comb. In the computation, 500 rovibrational states were taken into account in LiCl, and 200 spectral frequencies were included in the frequency comb. The LiCl molecule could be rotationally highly excited in gaseous mixture of LiCl and LiCl, by tuning spectral frequencies of the comb to rotational transition frequencies of LiCl. The isotope selectivity decreases with the increase of the intensity of comb electric field. The vibrational excitation was not induced by the comb employed here.