Kinetic And Spectroscopic Studies Of C₂^− In A Cryogenic Wire Trap

Nötzold, Markus

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https://hdl.handle.net/2142/111267 Copy

Description

Title

Kinetic And Spectroscopic Studies Of C₂⁻ In A Cryogenic Wire Trap

Author(s)

Nötzold, Markus

Contributor(s)

• Wester, Roland
• Lochmann, Christine
• Wild, Robert

Issue Date

2021-06-22

Keyword(s)

Ions

Abstract

The study of ion-molecule reactions plays a vital role in cold chemistry, thus implying the need of well-controlled ion ensembles in a cold environment. The internal and external degrees of freedom of molecular ions, trapped in multipole radio frequency ion traps, can be cooled via collisions with neutral atoms [1]. Usually the coolant undergoes collisions with a thermal shield mounted on a cryostat attaining temperatures of about 4 K. To overcome this lower temperature limit two approaches have been proposed. Firstly, using a laser-cooled buffer-gas localized at the center of the ion cloud [2]. Secondly, sympathetic cooling via a second laser cooled molecular anion like C$_{2}^{-}$ [3]. This, in addition to its potential role in forming carbon chain anions in the interstellar medium, makes C$_{2}^{-}$ an important molecule in anion research. In this contribution we present a newly developed 16-pole cryogenic radio frequency wire trap for spectroscopic and kinetic studies of molecular anions. First results of quenching rates of the first excited vibrational level of C$_{2}^{-}$ due to collisions with H$_{2}$ are presented. Furthermore, possible reaction pathways with H$_{2}$ are discussed and recent spectroscopic measurements of the second electronic excited state of C$_{2}^{-}$ are presented. References: [1] R. Wester , J. Phys. B 42, 154001 (2009) [2] B. Höltkemeier et al., Phys. Rev. A 94, 062703, (2016) [3] P. Yzombard et al., Phys. Rev. Lett. 114, 213001 (2015)

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/111267

DOI

10.15278/isms.2021.TL02

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