High Resolution Laboratory Spectroscopy

TL;DR

This review discusses recent advances in high-resolution laboratory spectroscopy, including broadband techniques, frequency extension to THz, and methods for studying complex molecules relevant to astrophysics.

Contribution

It highlights new experimental methods and technological developments that enhance the study of molecules for astronomical observations.

Findings

Development of broadband spectroscopy techniques

Extension of frequency range to THz for light hydrides

Efficient production of reactive species in laboratory

Abstract

In this short review we will highlight some of the recent advancements in the field of high-resolution laboratory spectroscopy that meet the needs dictated by the advent of highly sensitive and broadband telescopes like ALMA and SOFIA. Among these is the development of broadband techniques for the study of complex organic molecules, like fast scanning conventional absorption spectroscopy based on multiplier chains, chirped pulse instrumentation, or the use of synchrotron facilities. Of similar importance is the extension of the accessible frequency range to THz frequencies, where many light hydrides have their ground state rotational transitions. Another key experimental challenge is the production of sufficiently high number densities of refractory and transient species in the laboratory, where discharges have proven to be efficient sources that can also be coupled to molecular jets. For ionic molecular species sensitive action spectroscopic schemes have recently been developed to overcome some of the limitations of conventional absorption spectroscopy. Throughout this review examples demonstrating the strong interplay between laboratory and observational studies will be given.