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Laser applications and other topics in quantum electronics
Possibility of resonant three-photon isotope-selective excitation of vibrational states with v = 3 of the UF$_6$ molecule mode $\nu_3$ by radiation from two pulsed IR lasers in a gas-dynamically cooled molecular flow
G. N. Makarov Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow
Abstract:
We consider the possibility of resonant isotope-selective population of states with v = 3 of the vibrational mode
$\nu_3$ of UF
$_6$ molecules as a result of three-photon bichromatic excitation of the molecules by IR radiation from two pulsed CF
$_4$ lasers and two pulsed para-H
$_2$ lasers. We propose specific schemes and analyse the possibility of exciting the
$^{238}$UF
$_6$ and
$^{235}$UF
$_6$ molecules into states with v = 3 of the vibrational mode
$\nu_3$ using two CF
$_4$ lasers (or para-H
$_2$ lasers) generating in the region of 16
$\mu$m at frequencies that are significantly (by
$\sim$3.5 – 17 cm
$^{-1}$) detuned from the linear absorption bands at the frequencies of
$\nu_3$ vibration of these molecules in a gas-dynamically cooled molecular flow. However, the sum of the doubled lasing frequency 2
$\nu_{L1}$ of the first laser and the frequency
$\nu_{L2}$ of the second laser is equal to a frequency of the transition v = 0
$\to$ v = 3 of the vibrational mode
$\nu_3$ of the UF
$_6$ molecules. When both laser pulses coincide in time, the possibility of selective excitation of UF
$_6$ molecules from the ground vibrational state with v = 0 to the state with v = 3 of the vibrational mode
$\nu_3$ is realised. The proposed schemes for the excitation of UF
$_6$ molecules to states with v = 3 are compared with the previously implemented schemes for the effective excitation of states with v = 3 of the vibrational mode
$\nu_3$(F
$_1$) and states with v = 2 of the vibrational mode
$\nu_3$ (A
$_1$) of SF
$_6$ molecules by three- and two-frequency radiation of pulsed CO
$_2$ lasers, respectively.
Keywords:
atoms, molecules, clusters, uranium, molecular and cluster beams, laser spectroscopy, laser-induced selective processes in molecules and clusters, laser isotope separation, laser physics. Received: 26.04.2021
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