Selective preparation of enantiomers by laser pulses: quantum model simulation for H2POSH

Fujimura, Y.; González, Leticia; Hoki, Kunihito; Manz, J.; Ohtsuki, Yukiyoshi

doi:10.1016/s0009-2614(99)00440-6

Cited by 113 publications

(63 citation statements)

References 22 publications

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“…The possibility of achieving purification solely by optical means has been also theorized [5,6,7,8]. In particular, this goal could be realized via a "laser distillation" scheme [8], in which a repetitive use of three light pulses [9] gradually purifies the system.…”

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confidence: 99%

Two-Step Enantio-Selective Optical Switch

et al. 2003

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We present an optical "enantio-selective switch", that, in two steps, turns a ("racemic") mixture of left-handed and right-handed chiral molecules into the enantiomerically pure state of interest. The optical switch is composed of an "enantio-discriminator" and an "enantio-converter" acting in tandem. The method is robust, insensitive to decay processes, and does not require molecular preorientation. We demonstrate the method on the purification of a racemate of (transiently chiral) D2S2 molecules, performed on the nanosecond timescale.

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confidence: 99%

Two-Step Enantio-Selective Optical Switch

et al. 2003

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“…Such control may serve for novel information processing and molecular reaction controls, including bond breakage, structural isomerization, hydrogen bond rearrangement, proton transfer, etc. [2][3][4]. So far the MIR pulse shaping was applied to the ladder climbing of a single vibrational mode [5].…”

Section: Motivation and Objectivesmentioning

confidence: 99%

Controlling Quantum Interferences in IR Vibrational Excitations in Metal Carbonyls

Ashihara

Enomoto

Tayama

2013

EPJ Web of Conferences

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Abstract.Coherent controls over vibrational excitations in metal di-carbonyls were demonstrated by using phase-shaped mid-infrared pulses. The phase of the inter-state coherence between two different normal-modes was controlled by changing the phase step of the stepwise spectral phase profile. The quantum interference between multiple vibrational excitation paths in resonant two-step excitations was manipulated by the similar spectral phase control. The results experimentally confirmed that coherent control over multiple vibrational degrees of freedom works properly in condensed phases. There remains the possibility for increasing excitation efficiency by introducing group-delays and by optimizing polarization state of the excitation pulse. Motivation and ObjectivesCoherent control is a technique that manipulates interference of wave functions by adjusting their amplitudes and phases. Recent developments in the pulse shaping technique in MIR [1] may open a way toward coherent control over molecular motions/reactions at the electronic ground states. Such control may serve for novel information processing and molecular reaction controls, including bond breakage, structural isomerization, hydrogen bond rearrangement, proton transfer, etc. [2][3][4]. So far the MIR pulse shaping was applied to the ladder climbing of a single vibrational mode [5].The broadband nature of the ultrashort MIR pulses, however, should also be able to excite multiple vibrational modes in a correlated manner to control nuclear motion in multi-dimensional coordinates and to create highly-excited vibrational states. The ability to handle multiple vibrational modes should increase the variety and efficiency of controllable reactions. For such coherent control applications, control over quantum interference as well as efficient ladder climbing is essential. In this paper, we show that the quantum interferences in IR vibrational excitations were successfully controlled for liquid-phase molecules by use of MIR phase-shaping. MIR Pulse Shaping and Transient Absorption SpectroscopyMIR pulses of 100-fs duration and 5-J energy were generated by the OPA/DFG system. Major portion of the pulse energy was delivered to the pulse shaper, consisting of diffraction gratings, concave mirrors and the germanium AOM, developed by Zanni-group [1]. The shaped pulse was characterized by the electric-field cross correlation in the spectral interferometry with a reference EPJ Web of Conferences

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“…Incidentally, a method of optical control of chirality through the cooperative interaction of polarized light and vibronic interaction was proposed as early as in 1984 by Chiu, 43 and later Fujimura, Manz, and their colleague [44][45][46] proposed another method of laser control of chirality. Also, there are interesting discussions on the electronic and magnetic properties of chiral molecules in the literature of chemical dynamics.…”

Section: Introductionmentioning

confidence: 99%

Lorentz-like force emerging from kinematic interactions between electrons and nuclei in molecules: A quantum mechanical origin of symmetry breaking that can trigger molecular chirality

Takatsuka

2017

The Journal of Chemical Physics

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The Longuet-Higgins (Berry) phase arising from nonadiabatic dynamics and the Aharonov-Bohm phase associated with the dynamics of a charged particle in the electromagnetic vector potential are well known to be individually a manifestation of a class of the so-called geometrical phase. We herein discuss another similarity between the force working on a charged particle moving in a magnetic field, the Lorentz force, and a force working on nuclei while passing across a region where they have a strong quantum mechanical kinematic (nonadiabatic) coupling with electrons in a molecule. This kinematic force is indeed akin to the Lorentz force in that its magnitude is proportional to the velocity of the relevant nuclei and works in the direction perpendicular to its translational motion. Therefore this Lorentz-like nonadiabatic force is realized only in space of more or equal to three dimensions, thereby highlighting a truly multi-dimensional effect of nonadiabatic interaction. We investigate its physical significance qualitatively in the context of breaking of molecular spatial symmetry, which is not seen otherwise without this force. This particular symmetry breaking is demonstrated in application to a coplanar collision between a planar molecule and an atom sharing the same plane. We show that the atom is guided by this force to the direction out from the plane, resulting in a configuration that distinguishes one side of the mirror plane from the other. This can serve as a trigger for the dynamics towards molecular chirality.

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Selective preparation of enantiomers by laser pulses: quantum model simulation for H2POSH

Cited by 113 publications

References 22 publications

Two-Step Enantio-Selective Optical Switch

Two-Step Enantio-Selective Optical Switch

Controlling Quantum Interferences in IR Vibrational Excitations in Metal Carbonyls

Lorentz-like force emerging from kinematic interactions between electrons and nuclei in molecules: A quantum mechanical origin of symmetry breaking that can trigger molecular chirality

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