Abstract
Cold and dense samples of naphthalene (C(10)H(8)) are produced using buffer gas cooling in combination with rapid, high flow molecule injection. The observed naphthalene density is n approximately 10(11) cm(-3) over a volume of a few cm(3) at a temperature of 6 K. We observe naphthalene-naphthalene collisions through two-body loss of naphthalene with a loss cross section of sigma(N-N) = 1.4 x 10(-14) cm(2). Analysis is presented that indicates that this combination of techniques will be applicable to many comparably sized molecules. This technique can also be combined with cryogenic beam methods(1) to produce cold, high flux, continuous molecular beams.
Highlights
Driven by a variety of new science, including cold chemistry and dipolar quantum gases, several methods are being pursued to produce cold and ultracold samples of molecules
The cold molecules in these studies are generally diatomic and include few-atom molecules such as ND3.2,3 Extending this work to the cooling of larger molecules is of high interest, as reviewed by Meijer et al.[4] and references therein
Chemical reaction rates at low temperatures are of great current interest, and extending these studies to important large molecules is essential
Summary
Driven by a variety of new science, including cold chemistry and dipolar quantum gases, several methods are being pursued to produce cold and ultracold samples of molecules. Seeded supersonic beams have a rich history and have found great utility in spectroscopic studies,[7] as sources for molecular trapping experiments,[4] and in cold chemistry experiments using the CRESU technique.[8] They are limited, because they produce translationally and rotationally cold molecules, these molecules are moving at very high velocity (300 m sÀ1 or higher). It was an open question whether larger molecules in a cryogenic helium gas would rapidly accumulate a layer of bound helium atoms or instead remain ‘‘naked’’. In the latter case the naphthalene would cool to the helium temperature but remaining free of adsorbed helium atoms. Applicable to a wide variety of molecules of size comparable to (or smaller than) naphthalene
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