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Indexed by:期刊论文

Date of Publication:2019-05-30

Journal:PHYSICAL REVIEW A

Included Journals:SCIE、EI

Volume:99

Issue:5

ISSN No.:2469-9926

Key Words:Cooling; Molecules, Cooling process; Intermediate state; Millikelvin temperatures; Photoassociation; Rotational state; Rovibrational levels; Vibrational ground state; Vibrational state, Ground state

Abstract:We investigate theoretically the rovibrational cooling of the Rb-85(2) molecule resulting from the photoassociation of Rb-85(2) atoms at millikelvin temperature. At several millikelvin temperature, the populations of the initial state and the photoassociated Rb-85(2) molecule are distributed on hundreds of rovibrational levels. In the laser rovibrational cooling process, the population of the photoassociated molecule is first transferred to the deep vibrational state vertical bar psi(nu)''=39 > and then further to the rovibrational ground state vertical bar psi(nu)''=0,l=0 > via the intermediate state vertical bar psi(nu'=42,le=1)>. After the cooling process is over, the population transferred from the intermediate state vertical bar psi(nu)'(=42,le=1)> is fully distributed in the vibrational ground state vertical bar nu '' = 0 >. Of the population in the vibrational ground state, 51.59% is concentrated in the rotational ground state vertical bar l = 0 >, and the rest of population is distributed in the low rotational states vertical bar l = 1 - 3 >.