Files in this item

FilesDescriptionFormat

application/pdf

application/pdf2272.pdf (14kB)
(no description provided)PDF

Description

Title:A MOLECULAR FOUNTAIN
Author(s):Cheng, Cunfeng
Contributor(s):Bethlem, Hendrick; Ubachs, Wim; van der Poel, Aernout P.P.
Subject(s):Small molecules
Abstract:The resolution of any spectroscopic experiment is limited by the coherent interaction time between the probe radiation and the particle that is being studied. The introduction of cooling techniques for atoms and ions has resulted in a dramatic increase of interaction times and accuracy, it is hoped that molecular cooling techniques will lead to a similar increase. Here we demonstrate the first molecular fountain, a development which permits hitherto unattainably long interrogation times with molecules. In our experiment, beams of ammonia molecules are decelerated, trapped and cooled using inhomogeneous electric fields and subsequently launched. Using a combination of quadrupole lenses and buncher elements, the beam is shaped such that it has a large position spread and a small velocity spread (corresponding to a transverse temperature of less than 10$mu$K and a longitudinal temperature of less than 1$mu$K) while the molecules are in free fall, but strongly focused at the detection region. The molecules are in free fall for up to 266 milliseconds, making it possible, in principle, to perform sub-Hz measurements in molecular systems and paving the way for stringent tests of fundamental physics theories.
Issue Date:6/19/2017
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/96923
DOI:10.15278/isms.2017.MH04
Date Available in IDEALS:2017-07-27


This item appears in the following Collection(s)

Item Statistics