University of Illinois Urbana-Champaign

LEAK-OUT SPECTROSCOPY OF PROTONATED WATER DIMER II: SPIN STATISTICAL WEIGHTS

Salomon, Thomas

Content Files
6905.pdf
WA04_1.pptx

Permalink

https://hdl.handle.net/2142/122358

Description

Title
LEAK-OUT SPECTROSCOPY OF PROTONATED WATER DIMER II: SPIN STATISTICAL WEIGHTS
Author(s)
Salomon, Thomas
Contributor(s)
  • Schlemmer, Stephan
  • Asvany, Oskar
  • Markus, Charles R.
Issue Date
2023-06-21
Keyword(s)
Mini-symposium: Spectroscopy with Cryogenic Ion Traps
Abstract
It is widely believed that in the protonated water dimer the central proton is equally shared between the two water molecules (Zundel structure). This complex is subject to large amplitude motions and tunneling. It is an interesting question which motions are feasible and the answer to this question is tightly related to the underlying molecular symmetry group. For a semi-rigid complex the symmetry group is G$_{16}^{(2)}$. But when all five protons can swap places the underlying group is G$_{240}$. For these two situations the nuclear spin statistical weights are different. In a trap experiment where a finite ensemble of cold and mass selected ions is stored, it is now possible to determine the fractions of nuclear spin species by kicking out all ions belonging to one nuclear spin configuration using leak-out spectoscopy (LOS). Results from these measurements are much more reliable than comparing line intensities, which is a traditional approach to determine those fractions. This is because the fractions are directly determined from the temporal evolution of the number of ions in the trap. In this contribution we will present results for such LOS depletion experiments for the protonated water dimer. From a detailed analysis of our findings we infer information on the mobility of the central proton of this fundamental complex.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/122358
DOI
https://doi.org/10.15278/isms.2023.6905

Owning Collections

Abstracts & Presentations - 2023 International Symposium on Molecular Spectroscopy PRIMARY