TY - JOUR
T1 - Protocol for optically pumping AlH+to a pure quantum state
AU - Huang, Panpan
AU - Kain, Schuyler
AU - De Oliveira-Filho, Antonio G.S.
AU - Odom, Brian C.
N1 - Publisher Copyright:
© 2020 the Owner Societies.
PY - 2020/11/14
Y1 - 2020/11/14
N2 - We propose an optical pumping scheme to prepare trapped AlH+ molecules in a pure state, the stretched hyperfine state (Formula Presented) of the rovibronic ground manifold |X2Σ+, v = 0, N = 0 〉. Our scheme utilizes linearly-polarized and circularly-polarized fields of a broadband pulsed laser to cool the rotational degree of freedom and drive the population to the hyperfine state, respectively. We simulate the population dynamics by solving a representative system of rate equations that accounts for the laser fields, blackbody radiation, and spontaneous emission. In order to model the hyperfine structure, new hyperfine constants of the A2Π excited state were computed using a RASSCF wavefunction. We find that adding an infrared laser to drive the 1-0 vibrational transition within the X2Σ+ manifold accelerates the cooling process. The results show that, under optimal conditions, the population in the target state of the rovibronic ground manifold can reach 63% after 68 μs (330 ms) and 95% after 25 ms (1.2 s) with (without) the infrared laser.
AB - We propose an optical pumping scheme to prepare trapped AlH+ molecules in a pure state, the stretched hyperfine state (Formula Presented) of the rovibronic ground manifold |X2Σ+, v = 0, N = 0 〉. Our scheme utilizes linearly-polarized and circularly-polarized fields of a broadband pulsed laser to cool the rotational degree of freedom and drive the population to the hyperfine state, respectively. We simulate the population dynamics by solving a representative system of rate equations that accounts for the laser fields, blackbody radiation, and spontaneous emission. In order to model the hyperfine structure, new hyperfine constants of the A2Π excited state were computed using a RASSCF wavefunction. We find that adding an infrared laser to drive the 1-0 vibrational transition within the X2Σ+ manifold accelerates the cooling process. The results show that, under optimal conditions, the population in the target state of the rovibronic ground manifold can reach 63% after 68 μs (330 ms) and 95% after 25 ms (1.2 s) with (without) the infrared laser.
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U2 - 10.1039/d0cp04036c
DO - 10.1039/d0cp04036c
M3 - Article
C2 - 33084668
AN - SCOPUS:85095799230
SN - 1463-9076
VL - 22
SP - 24423
EP - 24430
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 42
ER -