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A new setup for low-temperature gas-phase ion fluorescence spectroscopy.
Christina Kjær1, Jeppe Langeland1, Thomas Toft Lindkvist1
1Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
The Review of Scientific Instruments
|April 6, 2021
Summary
A new instrument, LUNA2, measures ion fluorescence spectra at low temperatures. This luminescence instrument improves photon collection efficiency for enhanced spectral analysis of gaseous ions.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Physical Chemistry
Background:
- Gaseous ion fluorescence spectra analysis requires specialized instrumentation.
- Previous setups like LUNA offered room-temperature measurements.
- Low-temperature ion cooling enhances spectral resolution and data quality.
Purpose of the Study:
- Introduce LUNA2, a novel instrument for measuring dispersed fluorescence spectra of cold gaseous ions.
- Improve photon collection efficiency and operational experience from previous setups.
- Demonstrate the capability of LUNA2 for low-temperature ion spectroscopy.
Main Methods:
- Utilized a cylindrical Paul trap for ion confinement and laser interaction.
- Implemented a two-step mass selection scheme for improved resolution.
- Employed a liquid-nitrogen cooling unit for sub-100 K temperatures.
- Measured dispersed fluorescence using a spectrometer and intensified CCD camera.
Main Results:
- Successfully operated the LUNA2 instrument with rhodamine dyes and oxazine-4.
- Demonstrated the measurement of dispersed fluorescence spectra from cold gaseous ions.
- Identified spectral changes in response to temperature variations.
Conclusions:
- LUNA2 is a purpose-built instrument for low-temperature gaseous ion fluorescence spectroscopy.
- The instrument design enhances photon collection and mass selection capabilities.
- LUNA2 enables detailed spectral analysis of ions, with temperature-dependent insights.
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