title: Rapidly pulsed helium droplet source.
abstract: 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 10(4) and 10(6) 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.
authors.affiliation: Institute for Physical and Theoretical Chemistry, University of Regensburg, 93053 Regensburg, Germany.
authors.forename: Dominik
authors.initials: D
authors.lastname: Pentlehner
authors.forename: Ricarda
authors.initials: R
authors.lastname: Riechers
authors.forename: Bernhard
authors.initials: B
authors.lastname: Dick
authors.forename: Alkwin
authors.initials: A
authors.lastname: Slenczka
authors.forename: Uzi
authors.initials: U
authors.lastname: Even
authors.forename: Nachum
authors.initials: N
authors.lastname: Lavie
authors.forename: Raviv
authors.initials: R
authors.lastname: Brown
authors.forename: Kfir
authors.initials: K
authors.lastname: Luria