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Observation of the ponderomotive effect in non-valence bound states of polyatomic molecular anions.

ABSTRACT: The ponderomotive force on molecular systems has rarely been observed hitherto, despite potentially being extremely useful for the manipulation of the molecular properties. Here, the ponderomotive effect in the non-valence bound states has been experimentally demonstrated, for the first time to the best of our knowledge, giving great promise for the manipulation of polyatomic molecules by the dynamic Stark effect. Entire quantum levels of the dipole-bound state (DBS) and quadrupole-bound state (QBS) of the phenoxide (or 4-bromophenoxide) and 4-cyanophenoxide anions, respectively, show clear-cut ponderomotive blue-shifts in the presence of the spatiotemporally overlapped non-resonant picosecond control laser pulse. The quasi-free electron in the QBS is found to be more vulnerable to the external oscillating electromagnetic field compared to that in the DBS, suggesting that the non-valence orbital of the former is more diffusive and thus more polarizable compared to that of the latter.

SUBMITTER: Kang DH

PROVIDER: S-EPMC8651741 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature

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Observation of the ponderomotive effect in non-valence bound states of polyatomic molecular anions.

Kang Do Hyung DH Kim Jinwoo J Noh Heung-Ryoul HR Kim Sang Kyu SK

Nature communications 20211207 1

The ponderomotive force on molecular systems has rarely been observed hitherto, despite potentially being extremely useful for the manipulation of the molecular properties. Here, the ponderomotive effect in the non-valence bound states has been experimentally demonstrated, for the first time to the best of our knowledge, giving great promise for the manipulation of polyatomic molecules by the dynamic Stark effect. Entire quantum levels of the dipole-bound state (DBS) and quadrupole-bound state ( ...[more]

PMID: 34876596

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Project description:The dihydrogen-binding ability of polyatomic oxohalo anions ClO-, ClO2 -, ClO3 -, ClO4 -, BrO-, BrO2 -, BrO3 -, and BrO4 - has been studied at the M06L/6-311++G(d,p) density functional theory and the CCSD(T)/aug-cc-pVTZ//CCSD/aug-cc-pVDZ ab initio theory. The maximum number of dihydrogen adsorbed by the anions (n max) varies from 17 to 24 in the first coordination shell. As the number of H2 adsorbed varies from 1 to n max, the oxochloro and oxobromo anions show a wide range for interaction energy (E int), namely, 1.5-45.4 kcal/mol for the former and 1.4-46.0 kcal/mol for the latter. These results indicate that both series of anions show very similar and high affinity to bind with several dihydrogen molecules. Further, an increase in the coordination ability and a decrease in the strength of the dihydrogen interaction are observed with an increase in the number of oxygen atoms in the polyatomic anion. In contrast, the neutral oxohaloacids show negligible interaction with dihydrogen. The anion···H2 noncovalent interactions along with H···H dihydrogen interactions within the complex are ascertained by locating the bond critical points (bcps) in the quantum theory of atoms in molecules analysis. The electron density at the bcp summed up for all of the anion···H2 interactions (∑ρbcp) showed a strong linear relationship with E int, indicating that the stability of the complex is due to the formation of a large network of noncovalent bonds in the complex. The amount of electron density donated by the anion to the dihydrogen during complex formation is also gauged from the molecular electrostatic potential values at the nuclei (V n) of all of the atoms in the anion. The hydrogen uptake leads to a significant reduction in the negative character of V n, and the total change in V n from all of the anion atoms (∑ΔV n) is found to be directly proportional to E int. The polyatomic anions have a very high affinity toward dihydrogen binding, which can be utilized for the development of new hydrogen storage systems.

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Observation of the ponderomotive effect in non-valence bound states of polyatomic molecular anions.

Publications

Observation of the ponderomotive effect in non-valence bound states of polyatomic molecular anions.

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