Manipulating ultrafast even-order nonlinear chiral responses of L-tryptophan by polarization pulse shaping.
Proc Natl Acad Sci U S A
; 121(23): e2402660121, 2024 Jun 04.
Article
en En
| MEDLINE
| ID: mdl-38820001
ABSTRACT
Molecular chirality has long been monitored in the frequency domain in the ultraviolet, visible, and infrared regimes. Recently developed time-domain approaches can detect time-dependent chiral dynamics by enhancing intrinsically weak chiral signals. Even-order nonlinear signals in chiral molecules have gained attention thanks to their existence in the electric dipole approximation, without relying on the weaker higher-order multipole interactions. We illustrate the optimization of temporal polarization pulse-shaping in various frequency ranges (infrared/optical and optical/X ray) to enhance chiral nonlinear signals. These signals can be recast as an overlap integral of matter and field pseudoscalars which contain the relevant chiral information. Simulations are carried out for second- and fourth-order nonlinear spectroscopies in L-tryptophan.
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MEDLINE
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En
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Proc Natl Acad Sci U S A
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2024
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Article