Rapidly pulsed helium droplet source

  • A pulsed valve connected to a closed-cycle cryostat was optimized for producing helium droplets. The pulsed droplet beam appeared with a bimodal size distribution. The leading part of the pulse consists of droplets suitable for doping with molecules. The average size of this part can be varied between 104 and 106 helium atoms, and the width of the distribution is smaller as compared to a continuous-flow droplet source. The system has been tested in a single pulse mode and at repetition rates of up to 500 Hz with almost constant intensity. The droplet density was found to be increased by more than an order of magnitude as compared to a continuous-flow droplet source.

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Author:Dominik Pentlehner, Ricarda Riechers, B. Dick, Alkwin Slenczka, U. Even, N. Lavie, R. Brown, K. Luria
Parent Title (English):Review of scientific instruments
Document Type:Contribution to a Periodical
Publication Year:2009
Tag:Helium nanodroplets; Scientific instruments; Superfluids
faculties / departments:Fakultät für Chemische Technologie und Wirtschaft
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie
6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten