# Collisional excitation transfer and quenching in Rb(5P)-methane mixtures

## TL;DR

This study measures and analyzes the rates of collisional excitation transfer and quenching between rubidium's excited states in methane, providing more precise data and resolving previous measurement discrepancies.

## Contribution

It introduces ultrafast laser pulse techniques to accurately determine fine-structure mixing and quenching rates in Rb-methane collisions, improving precision over prior studies.

## Key findings

- Collisional transfer cross section: (4.23 ± 0.13) × 10^{-15} cm^2
- Quenching cross section: (7.52 ± 0.10) × 10^{-19} cm^2
- Enhanced measurement precision and resolution of previous discrepancies.

## Abstract

We have examined fine-structure mixing between the rubidium $5^{2}P_{3/2}$ and $5^{2}P_{1/2}$ states along with quenching of these states due to collisions with methane gas. Measurements are carried out using ultrafast laser pulse excitation to populate one of the Rb $5^{2}P$ states, with the fluorescence produced through collisional excitation transfer observed using time-correlated single-photon counting. Fine-structure mixing rates and quenching rates are determined by the time dependence of this fluorescence. As Rb($5^{2}P$) collisional excitation transfer is relatively fast in methane gas, measurements were performed at methane pressures of $2.5 - 25$ Torr, resulting in a collisional transfer cross section ($5^{2}P_{3/2} \rightarrow 5^{2}P_{1/2}$) of $(4.23 \pm 0.13) \times 10^{-15}$ cm$^{2}$. Quenching rates were found to be much slower and were performed over methane pressures of $50 - 4000$ Torr, resulting in a quenching cross section of $(7.52 \pm 0.10) \times 10^{-19}$ cm$^{2}$. These results represent a significant increase in precision compared to previous work, and also resolve a discrepancy in previous quenching measurements.