Detecting handedness of spatially oriented molecules by Coulomb explosion imaging

Abstract

We present a new technique for detecting chirality in the gas phase: Chiral molecules are spatially aligned in three-dimensions by a moderately strong elliptically-polarized laser field. The momentum distributions of the charged fragments, produced by laser-induced Coulomb explosion, show distinct three-dimensional orientation of the enantiomers, when the laser polarization ellipse is rotated by a non-right angle with respect to the norm vector of the detector plane. The resulting velocity-map-image asymmetry is directly connected to the enantiomeric excess and to the absolute handedness of molecules. We demonstrated our scheme computationally for camphor (C10H16O), with its methyl-groups as marker fragments, using quantum-mechanical simulations geared toward experimentally feasible conditions. Computed sensitivity to enantiomeric excess is comparable to other modern chiroptical approaches. The present method can be readily optimized for any chiral molecule with an anisotropic polarizability tensor by adjusting the polarization state and intensity profile of the laser field.

6 pages, 4 figures, accepted by JCP

References in corpus (8)

• Laser-induced alignment and orientation of quantum-state-selected large molecules
• Attosecond-resolved photoionization of chiral molecules
• Quantum-state selection, alignment, and orientation of large molecules using static electric and laser fields
• A selector for structural isomers of neutral molecules
• Controlled enantioselective orientation of chiral molecules with an optical centrifuge
• Gas-phase structural isomer identification by Coulomb explosion of aligned molecules
• Spatial separation of pyrrole and pyrrole-water clusters
• Time-dependent analysis of the mixed-field orientation of molecules without rotational symmetry

Cited by in corpus (4)

• Imaging charge-migration in chiral molecules using time-resolved x-ray diffraction
• Three Dimensional Orientation of Complex Molecules Excited by Two-Color Femtosecond Pulses
• A new route for enantio-sensitive structure determination by photoelectron scattering on molecules in the gas phase
• Numerical evaluation of orientation averages and its application to molecular physics