2012
DOI: 10.1063/1.4727883
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Pulsed rotating supersonic source for merged molecular beams

Abstract: We describe a pulsed rotating supersonic beam source, evolved from an ancestral device [M. Gupta and D. Herschbach, J. Phys. Chem. A 105, 1626 (2001)]. The beam emerges from a nozzle near the tip of a hollow rotor which can be spun at high-speed to shift the molecular velocity distribution downward or upward over a wide range. Here we consider mostly the slowing mode. Introducing a pulsed gas inlet system, cryocooling, and a shutter gate eliminated the main handicap of the original device, in which continuous … Show more

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Cited by 10 publications
(9 citation statements)
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References 55 publications
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“…Slow, velocity-controlled molecular beams have become an attractive tool in the study of molecular dynamics, the measurement of fundamental constants and in conducting high resolution spectroscopy [1][2][3][4][5]. Many advances have been made to produce slow beams such as using a high-pressure seeded expansion [6], pre-cooling from a buffer gas source [7,8], or by passing the gas through a cryo-cooled valve nozzle [9,10] or a roomtemperature nozzle spinning in a counter-rotating configuration [11][12][13]. Molecules in seeded supersonic beams can also be decelerated by undergoing inelastic collisions in a crossed beam set up to remove kinetic energy [14], or by using the interaction of the electric or magnetic dipole moments of the molecules with external optical dipole, electric, or magnetic fields [15][16][17][18][19].…”
Section: Introductionmentioning
confidence: 99%
“…Slow, velocity-controlled molecular beams have become an attractive tool in the study of molecular dynamics, the measurement of fundamental constants and in conducting high resolution spectroscopy [1][2][3][4][5]. Many advances have been made to produce slow beams such as using a high-pressure seeded expansion [6], pre-cooling from a buffer gas source [7,8], or by passing the gas through a cryo-cooled valve nozzle [9,10] or a roomtemperature nozzle spinning in a counter-rotating configuration [11][12][13]. Molecules in seeded supersonic beams can also be decelerated by undergoing inelastic collisions in a crossed beam set up to remove kinetic energy [14], or by using the interaction of the electric or magnetic dipole moments of the molecules with external optical dipole, electric, or magnetic fields [15][16][17][18][19].…”
Section: Introductionmentioning
confidence: 99%
“…The merged-beam experiments implemented in our laboratory aim both to test the capabilities of ordinary, basic apparatus [10] and to explore in the cold regime H atom reactions that have been well studied in the warm domain. We note some indicative aspects.…”
Section: Discussionmentioning
confidence: 99%
“…We have come across only three previous, very brief suggestions [12][13][14]. Our treatment accompanies experiments now underway at Texas A&M University [10].…”
Section: Introductionmentioning
confidence: 99%
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“…A different merged-beam approach, which relies on the use of a counter-rotating nozzle in combination with a second beam source, has been proposed by Herschbach and co-workers. 22,23 Besides that, it has also been possible to study low-energy ion-molecule collisions in a merged-beam setup using the Rydberg-deceleration technique. 24 Merged-beam experiments were also performed in the group of H. L. Bethlem using a storage ring that was tangentially crossed by a second supersonic beam.…”
Section: Introductionmentioning
confidence: 99%