Probing the interplay between geometric and electronic-structure features via high-harmonic spectroscopy
- The Ohio State Univ., Columbus, OH (United States)
- Louisiana State Univ., Baton Rouge, LA (United States)
- Univ. of Virginia, Charlottesville, VA (United States)
We present molecular-frame measurements of the recombination dipole matrix element (RDME) in CO2, N2O, and carbonyl sulfide (OCS) molecules using high-harmonic spectroscopy. Both the amplitudes and phases of the RDMEs exhibit clear imprints of a two-center interference minimum, which moves in energy with the molecular alignment angle relative to the laser polarization. Here, we find that whereas the angle dependence of this minimum is consistent with the molecular geometry in CO2 and N2O, it behaves very differently in OCS; in particular, the phase shift which accompanies the two-center minimum changes sign for different alignment angles. Our results suggest that two interfering structural features contribute to the OCS RDME, namely, (i) the geometrical two-center minimum and (ii) a Cooper-like, electronic-structure minimum associated with the sulfur end of the molecule. We compare our results to ab initio calculations using time-dependent density functional theory and present an empirical model that captures both the two-center and the Cooper-like interferences. We also show that the yield from unaligned samples of two-center molecules is, in general, reduced at high photon energies compared to aligned samples, due to the destructive interference between molecules with different alignments.
- Research Organization:
- The Ohio State Univ., Columbus, OH (United States); Louisiana State Univ., Baton Rouge, LA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- FG02-04ER15614; SC0012462
- OSTI ID:
- 1609522
- Alternate ID(s):
- OSTI ID: 1512532
- Journal Information:
- Journal of Chemical Physics, Vol. 150, Issue 18; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
High-harmonic spectroscopy of transient two-center interference calculated with time-dependent density-functional theory
|
journal | July 2019 |
Shaping attosecond pulses by controlling the minima in high-order harmonic generation through alignment of molecules
|
journal | January 2020 |
Influence of dynamic core-electron polarization on the structural minimum in high-order harmonics of molecules
|
journal | November 2019 |
Similar Records
Excitation two-center interference and the orbital geometry in laser-induced nonsequential double ionization of diatomic molecules
Angle dependence of strong-field single and double ionization of carbonyl sulfide