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

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Version 2 2023-06-12, 08:55
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journal contribution
posted on 2023-06-12, 08:55 authored by Amy Gardner, Timothy Softley, Matthias KellerMatthias Keller
In this paper we investigate the 2?+?1' resonance enhanced multi-photon ionisation (REMPI) of molecular nitrogen via the a1?g(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.

Funding

Low temperature Ion - Radical Collisions; G1744; EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL; EP/N004930/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Scientific Reports

ISSN

2045-2322

Publisher

Nature Research

Issue

506

Volume

9

Page range

1-8

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Atomic, Molecular and Optical Physics Research Group Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2018-12-18

First Open Access (FOA) Date

2019-01-25

First Compliant Deposit (FCD) Date

2018-12-14

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