Observation of Multichannel Collisions of Cold Metastable Calcium Atoms

Link:

https://doi.org/10.1103/physrevlett.96.073003

Autor/in:

Erscheinungsjahr:

2006

Medientyp:

Text

Beschreibung:

Recent theoretical work indicates that collisions between metastable alkaline-earth atoms (AEAs) in the presence of external magnetic fields should be largely determined by partial waves with large angular momenta even at very low temperatures. Unusually large inelastic collision cross sections were predicted and doubts have been raised regarding the feasibility of evaporative cooling of metastable AEAs in magnetic traps. Here we present experimental data for Ca40[4s4p]P23 clearly confirming the asserted multichannel character of the collision mechanism. While elastic cross sections are found to be similar to the predicted values, inelastic cross sections exceed the calculations by an order of magnitude. Our results substantiate the expectation of inefficient evaporative cooling. © 2006 The American Physical Society.

Lizenz:

info:eu-repo/semantics/closedAccess

Quellsystem:

Forschungsinformationssystem der UHH

Interne Metadaten

Quelldatensatz: oai:www.edit.fis.uni-hamburg.de:publications/70f85fd5-8e7a-4c11-9673-64ec852c50ec