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Computer simulation of isotope-selective vibrational excitation of lithium chloride molecules by optical pulses

Ichihara, Akira 

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 $$^{7}$$Li$$^{35}$$Cl and $$^{7}$$Li$$^{37}$$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.

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