Mechanism of Collisional Spin Relaxation in 3Σ Molecules

被引：43

作者：

Campbell, Wesley C. ^{[1
,2
]}

Tscherbul, Timur V. ^{[3
]}

Lu, Hsin-I ^{[2
,4
]}

Tsikata, Edem ^{[1
,2
]}

Krems, Roman V. ^{[3
]}

Doyle, John M. ^{[1
,2
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[2] Harvard MIT Ctr Ultracold Atoms, Cambridge, MA 02138 USA

[3] Univ British Columbia, Dept Chem, Vancouver, BC V6T 1Z1, Canada

[4] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 01期

基金：

加拿大自然科学与工程研究理事会;

关键词：

FIELD;

D O I：

10.1103/PhysRevLett.102.013003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measure and theoretically determine the effect of molecular rotational splitting on Zeeman relaxation rates in collisions of cold (3)Sigma molecules with helium atoms in a magnetic field. All four stable isotopomers of the imidogen (NH) molecule are magnetically trapped and studied in collisions with He-3 and He-4. The He-4 data support the predicted 1/B-e(2) dependence of the collision-induced Zeeman relaxation rate coefficient on the molecular rotational constant B-e. The measured He-3 rate coefficients are much larger than the He-4 coefficients, depend less strongly on B-e, and theoretical analysis indicates they are strongly affected by a shape resonance. The results demonstrate the influence of molecular structure on collisional energy transfer at low temperatures.

引用

页数：4

共 13 条

[1] Magnetic trapping and Zeeman relaxation of NH (X 3Σ-) [J].

Campbell, Wesley C. ;

Tsikata, Edem ;

Lu, Hsin-I ;

van Buuren, Laurens D. ;

Doyle, John M. .

PHYSICAL REVIEW LETTERS, 2007, 98 (21)

[2] Interaction of NH(X 3Σ-) with He:: Potential energy surface, bound states, and collisional Zeeman relaxation -: art. no. 094307 [J].

Cybulski, H ;

Krems, RV ;

Sadeghpour, HR ;

Dalgarno, A ;

Klos, J ;

Groenenboom, GC ;

van der Avoird, A ;

Zgid, D ;

Chalasinski, G .

JOURNAL OF CHEMICAL PHYSICS, 2005, 122 (09)

[3] Quantum computation with trapped polar molecules [J].

DeMille, D .

PHYSICAL REVIEW LETTERS, 2002, 88 (06) :4

[4] Buffer-gas cooling of NH via the beam loaded buffer-gas method [J].

Egorov, D ;

Campbell, WC ;

Friedrich, B ;

Maxwell, SE ;

Tsikata, E ;

van Buuren, LD ;

Doyle, JM .

EUROPEAN PHYSICAL JOURNAL D, 2004, 31 (02) :307-311

[5] Theoretical study of geometric phase effects in the hydrogen-exchange reaction [J].

Juanes-Marcos, JC ;

Althorpe, SC ;

Wrede, E .

SCIENCE, 2005, 309 (5738) :1227-1230

[6] Cold controlled chemistry [J].

Krems, R. V. .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2008, 10 (28) :4079-4092

[7] Molecules near absolute zero and external field control of atomic and molecular dynamics [J].

Krems, RV .

INTERNATIONAL REVIEWS IN PHYSICAL CHEMISTRY, 2005, 24 (01) :99-118

[8] Low-temperature collisions of NH(X3Σ-) molecules with He atoms in a magnetic field:: An ab initio study -: art. no. 051401 [J].

Krems, RV ;

Sadeghpour, HR ;

Dalgarno, A ;

Zgid, D ;

Klos, J ;

Chalasinski, G .

PHYSICAL REVIEW A, 2003, 68 (05) :4

[9] Quantum-mechanical theory of atom-molecule and molecular collisions in a magnetic field: Spin depolarization [J].

Krems, RV ;

Dalgarno, A .

JOURNAL OF CHEMICAL PHYSICS, 2004, 120 (05) :2296-2307

[10] Long-range scattering resonances in strong-field-seeking states of polar molecules [J].

Ticknor, C ;

Bohn, JL .

PHYSICAL REVIEW A, 2005, 72 (03)

← 1 2 →