@article{oai:repo.qst.go.jp:00075874,
 author = {黒崎, 譲 and 横山, 啓一 and Kurosaki, Yuzuru},
 issue = {5},
 journal = {Universe},
 month = {May},
 note = {We investigate the roles of one-photon and two-photon processes in the laser-controlled rovibrational transitions of diatomic alkali halide, 7Li37Cl. Optimal control theory calculations are carried out using the Hamiltonian including both the one-photon and two-photon field-molecule interaction terms. Time-dependent wave packet propagation is performed with both the radial and angular motions being treated quantum mechanically. The targeted processes are pure rotational and vibrational-rotational excitations: (v = 0, J = 0) → (v = 0, J = 2); (v = 0, J = 0) → (v = 1, J = 2). Total time of the control pulse is set to 2000000 atomic unit (48.4 ps). In each control excitation process weak and strong optimal fields are obtained by means of giving weak and strong field amplitudes, respectively, to the initial guess for the optimal field. It is found that when the field is weak the control mechanism is dominated exclusively by a one-photon process, as expected, in both the targeted processes. When the field is strong we obtain two kinds of optimal fields, one causing two-photon absorption and the other causing Raman process. It is revealed, however, that the mechanisms for strong fields are not simply characterized by one process but rather by multiple one- and two-photon processes. It is also found that in the rotational excitation, (v = 0, J = 0) → (v = 0, J = 2), the roles of one- and two-photon processes are relatively distinct but in the vibrational-rotational excitation, (v = 0, J = 0) → (v = 1, J = 2), these roles are ambiguous and the cooperative effect associated with these two processes is quite large.},
 pages = {109-1--109-15},
 title = {Quantum optimal control of rovibrational excitations of a diatomic alkali halide: one-photon vs. two-photon processes},
 volume = {5},
 year = {2019}
}