Accurate frequency determination of vibration-rotation and rotational transitions of SiH+

TL;DR

This study precisely measures vibration-rotation and rotational transitions of SiH+ using advanced spectrometers, providing data crucial for astrophysical detection and analysis of this ion in space.

Contribution

It presents the first high-accuracy measurements of SiH+ vibration-rotation and rotational transitions, combining laser and cryogenic ion trap spectroscopy.

Findings

23 vibration-rotation transitions measured with high accuracy

First direct measurement of the pure rotational transition at 453056.3632 MHz

Data enables astrophysical searches for SiH+ in space

Abstract

The fundamental 28SiH+ ion has been characterized in a collaborative work, utilizing a hollow-cathode-discharge laser-spectrometer and a cryogenic ion trap spectrometer. Twenty-three vibration-rotation transitions around 4.75 um have been detected with high accuracy. This has facilitated the first direct measurement of the pure rotational transition J=1<-0 at 453056.3632(4) MHz in the trap spectrometer. The measured and accurately predicted transitions enable the search for this ion in space with IR and sub-mm telescopes.