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Kurosaki, Yuzuru*; Yokoyama, Keiichi
Universe (Internet), 5(5), p.109_1 - 109_15, 2019/05
Times Cited Count：0 Percentile：0.01(Astronomy & Astrophysics)Regarding rovibrational transitions of diatomic alkali haride molecules, optimal waveform of laser electric field was calculated on the basis of the optimal control theory. In this study, we implemented the polarizability term into the Hamiltonian, which defines the field-molecule interaction. As a result, we obtained waveforms causing both one- and two-photon processes in a relatively high electric field regime, while waveforms causing only one-photon process was observed in a weak filed regime as well as the previous study. These results imply that the effect of two-photon process is successfully taken into account in the optimal control theory calculation. Now we can expect more reliable calculation even for strong laser field.
Ichihara, Akira
no journal, ,
We explored the pulse shape to excite the vibrational states of diatomic molecules whose rotational states were excited isotope-selectively by a terahertz pulse train. Computer simulations based on the coupled-channel method were performed using the gaseous 
Li
Cl and Li
Cl ensembles in 70 K. The isotope-selective vibrational excitation was investigated using the pulse which has a quasi-rectangle or the Gaussian spectrum. The results indicated that the isotope-selective vibrational excitation can be induced effectively by specifying the spectral frequency range referring to the transition frequencies in the P- and R-branches of molecules. The P-branch transition plays an important role on the excitation in low vibrational states, and both the P- and R-branch transitions contribute to the excitation in high vibrational states.
Kurosaki, Yuzuru*; Yokoyama, Keiichi
no journal, ,
Electric field of laser pulses is designed by the optimal control theory. The target process is isotope-selective rovibrational excitation of two isotopologues of the lithium chloride molecule, LiCl or LiCl. The calculation includes both radial and angular motion of atoms in molecule. As a result, it is found that a laser pulse field which can cause isotope-selective rovibrational excitation with high yield exists.
