Rotational cooling efficiency upon molecular ionization: the case of Li$_2(a^3Σ_u^+)$ and Li$_2^+(X^2Σ_g^+)$ interacting with $^4$He

Details Rotational cooling efficiency upon molecular ionization: the case of Li$_2(a^3Σ_u^+)$ and Li$_2^+(X^2Σ_g^+)$ interacting with $^4$He Rotational cooling efficiency upon molecular ionization: the case of Li$_2(a^3Σ_u^+)$ and Li$_2^+(X^2Σ_g^+)$ interacting with $^4$He

2007-07-12

arxiv.org/abs/0707.1832v1

Physics

Chemical Physics

Scientific paper

The low-temperature (up to about 100K) collisional (de)excitation cross sections are computed using the full coupled-channel (CC) quantum dynamics for both Li$_2$ and Li$_2^+$ molecular targets in collision with $^4$He. The interaction forces are obtained from fairly accurate {\it ab initio} calculations and the corresponding pseudo-rates are also computed. The results show surprising similarities between sizes of inelastic flux distributions within final states in both systems and the findings are connected with the structural change in the molecular rotor features when the neutral species is replaced by its ionic counterpart.

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