Research output: Contribution to journal › Article › peer-review
Experimental and theoretical investigations of HeNeI2 trimer. / Andreev, Aleksei S.; Baturo, Vera V.; Lukashov, Sergey S.; Poretsky, Sergey A.; Pravilov, Anatoly M.; Zhironkin, Anatoly I.
In: The Journal of Chemical Physics, Vol. 152, No. 23, 34307, 21.06.2020.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Experimental and theoretical investigations of HeNeI2 trimer
AU - Andreev, Aleksei S.
AU - Baturo, Vera V.
AU - Lukashov, Sergey S.
AU - Poretsky, Sergey A.
AU - Pravilov, Anatoly M.
AU - Zhironkin, Anatoly I.
N1 - Funding Information: The authors acknowledge the Russian Foundation for Basic Research (Grant No. 18-33-01014). Ab initio calculations were carried out using resources provided by Resource Center “Computer Center of SPbU” (http://cc.spbu.ru).
PY - 2020/6/21
Y1 - 2020/6/21
N2 - We report on the results of spectroscopic studies of the HeNeI2 van der Waals trimer using the two-step two-color HeNeI2(E0g+, vE = 0-3 ←hν2B0u+, vB = 19 ←hν1X0g+, vX = 0) excitation scheme. The excitation spectra of the HeNeI2(B, E) decay product luminescence and the luminescence spectra of I2 ion-pair states formed after HeNeI2(E) decay have been recorded and analyzed. The HeNeI2(X, B, E) binding energies have been estimated to be less than 111.8 cm-1, 101.6 cm-1, and 117.9 cm-1, respectively. The HeNeI2(B, vB) state decay has been found to be sequential with the formation of the HeI2(B, vB - 1) and NeI2(B, vB - 1) complexes without intermolecular excitation at the first step. An analysis of the HeNeI2(E) decay process based on the relative probabilities of the I2(D0u+) and I2(β1g) formation after decay, as well as vibrational populations of these states obtained from luminescence spectra, has also been performed. Calculations of the HeNeI2(X, B) vibrational energies using potential energy surfaces (PESs) of HeNeI2(X, B) constructed as a sum of the HeNe, HeI2, and NeI2 potentials have been carried out. The values obtained agree well with the experimental estimations, and the observed transitions can be ascribed to the HeNeI2 trimer of a tetrahedral geometry. Besides, a comparison of the PES constructed as a sum of the coupled-cluster single double triple [CCSD(T)] potentials with the PES based on the "direct" CCSD(T) calculations has been performed for the HeNeI2(X) trimer to verify the applicability of this representation to the trimer under study.
AB - We report on the results of spectroscopic studies of the HeNeI2 van der Waals trimer using the two-step two-color HeNeI2(E0g+, vE = 0-3 ←hν2B0u+, vB = 19 ←hν1X0g+, vX = 0) excitation scheme. The excitation spectra of the HeNeI2(B, E) decay product luminescence and the luminescence spectra of I2 ion-pair states formed after HeNeI2(E) decay have been recorded and analyzed. The HeNeI2(X, B, E) binding energies have been estimated to be less than 111.8 cm-1, 101.6 cm-1, and 117.9 cm-1, respectively. The HeNeI2(B, vB) state decay has been found to be sequential with the formation of the HeI2(B, vB - 1) and NeI2(B, vB - 1) complexes without intermolecular excitation at the first step. An analysis of the HeNeI2(E) decay process based on the relative probabilities of the I2(D0u+) and I2(β1g) formation after decay, as well as vibrational populations of these states obtained from luminescence spectra, has also been performed. Calculations of the HeNeI2(X, B) vibrational energies using potential energy surfaces (PESs) of HeNeI2(X, B) constructed as a sum of the HeNe, HeI2, and NeI2 potentials have been carried out. The values obtained agree well with the experimental estimations, and the observed transitions can be ascribed to the HeNeI2 trimer of a tetrahedral geometry. Besides, a comparison of the PES constructed as a sum of the coupled-cluster single double triple [CCSD(T)] potentials with the PES based on the "direct" CCSD(T) calculations has been performed for the HeNeI2(X) trimer to verify the applicability of this representation to the trimer under study.
KW - DER-WAALS MOLECULES
KW - REAL-TIME DYNAMICS
KW - ION-PAIR STATES
KW - VIBRATIONAL PREDISSOCIATION
KW - DISSOCIATION DYNAMICS
KW - BASIS-SETS
KW - GROUND-STATE
KW - COMPLEXES
KW - CLUSTERS
KW - ENERGY
UR - http://www.scopus.com/inward/record.url?scp=85086940994&partnerID=8YFLogxK
U2 - 10.1063/5.0008760
DO - 10.1063/5.0008760
M3 - Article
C2 - 32571063
AN - SCOPUS:85086940994
VL - 152
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 23
M1 - 34307
ER -
ID: 60703613