Hyperfine-Structure-Induced Depolarization of Impulsively Aligned 
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 Molecules

Thomas, Esben Folger; Søndergaard, Anders A.; Shepperson, Benjamin; Henriksen, Niels Engholm; Stapelfeldt, Henrik

doi:10.1103/physrevlett.120.163202

Cited by 26 publications

(18 citation statements)

References 43 publications

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“…The orientation factors were found to be quite robust against the detrimental effects of temperature provided that the time delay is adjusted appropriately. The orientation dynamics on timescales beyond nanoseconds requires a more detailed analysis, as other effects such as collisions and fine structure effects [67] become important in addition to dynamical tunneling. The relative importance of such effects should be assessed in future works.…”

Section: Discussionmentioning

confidence: 99%

Selective Orientation of Chiral Molecules by Laser Fields with Twisted Polarization

Tutunnikov

Gershnabel

Gold

et al. 2018

J. Phys. Chem. Lett.

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We explore a pure optical method for enantioselective orientation of chiral molecules by means of laser fields with twisted polarization. Several field implementations are considered, including a pair of delayed, cross-polarized laser pulses, an optical centrifuge, and polarization-shaped pulses. We show that these schemes lead to out-of-phase time-dependent dipole signals for different enantiomers, and we also predict a substantial permanent molecular orientation persisting long after the laser fields are over. The underlying classical orientation mechanism common to all of these fields is discussed, and its operation is demonstrated for a range of chiral molecules of various complexity: hydrogen thioperoxide (HSOH), propylene oxide (CHCHCHO), and ethyl oxirane (CHCHCHCHO). The presented results demonstrate generality, versatility, and robustness of this optical method for manipulating molecular enantiomers in the gas phase.

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Section: Discussionmentioning

confidence: 99%

Selective Orientation of Chiral Molecules by Laser Fields with Twisted Polarization

Tutunnikov

Gershnabel

Gold

et al. 2018

J. Phys. Chem. Lett.

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“…However, for a rarefied molecular gas, the estimated relative energy loss during a single revival is very small. The proper description of the behavior on an even longer timescale (nanoseconds), requires the inclusion of collisions and fine structure effects [66,67], which is beyond the scope of the current work. Furthermore, it should be noted that higher laser pulse intensities lead to higher degree of orientation, but when the intensity is high enough for molecular ionization, another effect kicks in, namely orientation mechanism due to selective molecular ionization of molecules with specific orientation [43,44].…”

Section: Long-lasting Orientationmentioning

confidence: 99%

Long-Lasting Orientation of Symmetric-Top Molecules Excited by Two-Color Femtosecond Pulses

Tutunnikov

Prior

et al. 2021

Front. Phys.

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Impulsive orientation of symmetric-top molecules excited by two-color femtosecond pulses is considered. In addition to the well-known transient orientation appearing immediately after the pulse and then reemerging periodically due to quantum revivals, we report the phenomenon of field-free long-lasting orientation. Long-lasting means that the time averaged orientation remains non-zero until destroyed by other physical effects, e.g., intermolecular collisions. The effect is caused by the combined action of the field-polarizability and field-hyperpolarizability interactions. The dependence of degree of long-lasting orientation on temperature and pulse parameters is considered. The effect can be measured by means of second (or higher-order) harmonic generation, and may be used to control the deflection of molecules traveling through inhomogeneous electrostatic fields.

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Section: Long-lasting Orientationmentioning

confidence: 99%

Long-Lasting Orientation of Symmetric-top Molecules Excited by Two-Color Femtosecond Pulses

Xu,

Tutunnikov,

Prior

et al. 2021

Preprint

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Impulsive orientation of symmetric-top molecules excited by two-color femtosecond pulses is considered. In addition to the well-known transient orientation appearing immediately after the pulse and then reemerging periodically due to quantum revivals, we report the phenomenon of field-free long-lasting orientation. Long-lasting means that the time averaged orientation remains non-zero until destroyed by other physical effects, e.g. intermolecular collisions. The effect is caused by the combined action of the field-polarizability and field-hyperpolarizability interactions. The dependence of degree of long-lasting orientation on temperature and pulse's parameters is considered. The effect can be measured by means of second (or higher-order) harmonic generation, and may be used to control the deflection of molecules traveling through inhomogeneous electrostatic fields.

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Hyperfine-Structure-Induced Depolarization of Impulsively Aligned I2 Molecules

Cited by 26 publications

References 43 publications

Selective Orientation of Chiral Molecules by Laser Fields with Twisted Polarization

Selective Orientation of Chiral Molecules by Laser Fields with Twisted Polarization

Long-Lasting Orientation of Symmetric-Top Molecules Excited by Two-Color Femtosecond Pulses

Long-Lasting Orientation of Symmetric-top Molecules Excited by Two-Color Femtosecond Pulses

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