Improved tandem mass spectrometer coupled to a laser vaporization cluster ion source

Area of Science:

• Physical Chemistry
• Atomic and Molecular Physics
• Spectroscopy

Background:

• Tandem mass spectrometry coupled with laser vaporization is crucial for cluster ion studies.
• Existing setups have limitations in sensitivity and the size of clusters that can be analyzed.

Purpose of the Study:

• To enhance a tandem mass spectrometer for improved cluster ion photodissociation spectroscopy.
• To enable the production and detailed study of larger and rare gas solvated clusters.

Main Methods:

• Implemented nozzle cooling in the cluster ion source.
• Replaced an octupole ion guide with a quadrupole mass spectrometer for mass selection prior to photodissociation.

Main Results:

• Achieved enhanced sensitivity and transmission, allowing for larger heteroatomic and rare gas solvated clusters.
• Demonstrated production of SiAr_n⁺ and Si₂Ar_n⁺ (n=1-25) and extracted magic numbers.
• Recorded high-resolution vibronic photodissociation spectrum of cold Au₄⁺ cluster ions.

Conclusions:

• The upgraded mass spectrometer significantly improves capabilities for cluster ion research.
• The detailed spectra of cold cluster ions serve as benchmarks for theoretical calculations.
• This work advances the study of atomic and metal clusters using photodissociation spectroscopy.