Pulsed supersonic source producing clusters with an adjustable vibrational temperature

Autor:	Jean-Pierre Bucher, Louis A. Bloomfield, D. C. Douglass
Rok vydání:	1992
Předmět:	Thermal equilibrium Materials science Physics::Atomic and Molecular Clusters Cluster (physics) Supersonic speed Cryogenics Atomic physics Helium-3 refrigerator Instrumentation Choked flow Vibrational temperature Superparamagnetism
Zdroj:	Review of Scientific Instruments. 63:5667-5670
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1143346
Popis:	We report the construction and operation of a novel cluster source that produces clusters with well‐defined vibrational temperatures. Clusters seeded in He gas are thermalized in a cavity before undergoing a weak supersonic expansion. This weak expansion does not affect their vibrational temperature. An optimized source design ensures a high cluster density in the beam. The vibrational temperature is measured by studying the magnetic deflection of superparamagnetic clusters. We show that thermal equilibrium with the source temperature is achieved for long residence times of the clusters in the cavity. A closed‐cycle helium refrigerator coupled to the source body controls the source temperature. Under these conditions, cluster vibrational temperatures from 58 to 300 K are currently obtained.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b341dfb27e7892bcfb294864b6a19433 https://doi.org/10.1063/1.1143346 Zobrazit plný text záznamu