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Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation

Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation

Published on: October 30, 2012

Pulsed rotating supersonic source for merged molecular beams.

L Sheffield¹, M S Hickey, V Krasovitskiy

¹Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA.

The Review of Scientific Instruments

|July 5, 2012

Summary

A novel pulsed rotating supersonic beam source enables precise control over molecular beam speeds, significantly advancing molecular beam applications. This improved source delivers intense molecular pulses at tunable velocities for enhanced collision experiments.

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Area of Science:

Chemical Physics
Molecular Beam Spectroscopy
Atomic and Molecular Physics

Background:

Traditional supersonic beam sources face limitations with continuous gas flow, leading to high background pressures.
Previous rotating beam source designs were hindered by continuous gas flow, limiting their practical application.

Purpose of the Study:

To develop an improved pulsed rotating supersonic beam source with enhanced performance and reduced background pressure.
To enable precise control over molecular beam velocities for advanced experimental applications, particularly in collision studies.

Main Methods:

Evolved an ancestral pulsed rotating supersonic beam source by incorporating a pulsed gas inlet system, cryocooling, and a shutter gate.
Utilized a high-speed spinning rotor to modify the molecular velocity distribution, enabling both slowing and speeding of molecular beams.
Generated intense molecular pulses with durations of 0.1-0.6 ms, containing approximately 10^12 to 10^15 molecules.

Main Results:

Achieved tunable molecular beam speeds as low as 35 m/s and up to 400 m/s.
Successfully produced slow and fast beams of various molecules including rare gases, O2, Cl2, NO2, NH3, and SF6.
Demonstrated the capability to generate intense molecular pulses with significantly reduced background pressure compared to previous designs.

Conclusions:

The new pulsed rotating supersonic beam source offers a significant advancement for molecular beam research by providing tunable velocities and intense pulses.
This technology is particularly advantageous for collision experiments, enabling the attainment of very low relative collision energies through precise beam speed matching.
The ability to control molecular beam speed by adjusting rotor speed opens new possibilities for various applications in chemical physics and beyond.