Multi-photon ionisation spectroscopy for rotational state preparation of N+2

Gardner, Amy, Softley, Timothy and Keller, Matthias (2019) Multi-photon ionisation spectroscopy for rotational state preparation of N+2. Scientific Reports, 9 (506). pp. 1-8. ISSN 2045-2322

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In this paper we investigate the 2 + 1′ resonance enhanced multi-photon ionisation (REMPI) of molecular nitrogen via the a1Πg(v = 6) intermediate state and analyse its feasibility to generate molecular nitrogen ions in a well defined ro-vibrational state. This is an important tool for high precision experiments based on trapped molecular ions, and is crucial for studying the time variation of the fundamental constant mp/me using N+2. The transition is not reported in the literature and detailed spectral analysis has been conducted to extract the molecular constants of the intermediate state. By carefully choosing the intermediate ro-vibrational state, the ionisation laser wavelength and controlling the excitation laser pulse energy, unwanted formation of rotationally excited molecular ions can be suppressed and ro-vibrational ground state ions can be generated with high purity.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Atomic, Molecular and Optical Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Alice Jackson
Date Deposited: 18 Dec 2018 11:32
Last Modified: 08 Apr 2019 13:01

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Project NameSussex Project NumberFunderFunder Ref
Low temperature Ion - Radical CollisionsG1744EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCILEP/N004930/1