Dr. E. K. Campbell: “Electronic spectroscopy of ions of astrochemical interest”

ABSTRACT: One of the most versatile techniques available at present to obtain the spectra of cold molecular ions is based on ion storage in a cryogenic radiofrequency trap. Over the last few years, parallel activities in a several research groups have pushed the temperature of these devices to their lowest limits. Routine tagging of virtually any cation with helium atom(s) has led to a relatively straightforward route to obtain gas phase spectroscopic information on buffer gas cooled molecular ions.[1] Moreover, a new sensitive method for detecting the absorption of a photon emerged.[2] In this talk I will highlight some of our experimental work on the fullerenes and related molecular species of putative astrochemical interest, and discuss the implications.[3] Time permitting, I will describe some of our current activities which involve combining non-standard methods for the synthesis and characterisation of complex molecular ions, and present some preliminary results on carbon cations Cn+ that thus far evaded spectroscopic investigation in the gas phase.

[1] Gerlich, J. Chin. Chem. Soc. 65, 637-653 (2018).
[2] Chakrabarty et al., J Phys. Chem. Lett., 4, 4051-4054 (2013).
[3] Maier & Campbell, Int. J. Mass Spectrom., 434, 116-122 (2018).