By Topic

Cool pulsed molecular microbeam

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

The purchase and pricing options are temporarily unavailable. Please try again later.
5 Author(s)
Zhao, Bum Suk ; Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138 ; Castillejo, Marta ; Doo Soo Chung ; Friedrich, Bretislav
more authors

Your organization might have access to this article on the publisher's site. To check, click on this link: 

We produce a cool pulsed supersonic molecular beam of CaF radicals essentially without recourse to pumping. The radicals are generated by laser ablating a solid precursor target in a small ablation cell of volume of about 0.01 cm3. The target is ablated through a 750 μm orifice by a pulsed Nd:YAG laser. The ablation plume supersonically expands into a vacuum chamber and cools the initially hot CaF molecules seeded in it. We enhance the supersonic character of the expansion by feeding into the ablation cell about 10 Torr of He, Ar, or Xe carrier gas. The CaF molecules are probed by time-dependent laser absorption spectroscopy. With a Xe carrier, about 1012 CaF molecules are found to be seeded in a single pulse and cooled down to a terminal translational temperature of about 140 K. We expect that a wide variety of species, including highly unstable ones, will be amenable to forming such a cool intense molecular microbeam, to the benefit of spectroscopy, reaction dynamics, and microfabrication. © 2004 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:75 ,  Issue: 1 )