MAGNETOOPTICAL TRAPPING OF METASTABLE HELIUM - COLLISIONS IN THE PRESENCE OF RESONANT LIGHT

被引:69
作者
BARDOU, F [1 ]
EMILE, O [1 ]
COURTY, JM [1 ]
WESTBROOK, CI [1 ]
ASPECT, A [1 ]
机构
[1] COLL FRANCE,F-75005 PARIS,FRANCE
来源
EUROPHYSICS LETTERS | 1992年 / 20卷 / 08期
关键词
D O I
10.1209/0295-5075/20/8/003
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
About 10(4) triplet metastable helium atoms have been trapped in a magneto-optical trap, based on the 23S1-23P2 transition at 1.083 mum (volume 0.1 mm3, temperature 1 mK). The losses of the trap are analysed by monitoring the ion current due to Penning collisions either with background gases, or between trapped atoms. The rate coefficient for these collisions between trapped metastable helium atoms has been found to be unusually large, and the crucial role of the quasi-resonant laser light has been experimentally demonstrated. The rate coefficient of the dominant process (He* (2(3)S1) + He* (2(3)P2) Penning collisions) has been measured by two different methods, and found to be K(sp) congruent-to 10(-7) cm3s-1 within an estimated factor of 4. The corresponding cross-section is 6.10(6) angstrom2.
引用
收藏
页码:681 / 686
页数:6
相关论文
共 22 条
[1]   TRAPPING OF NEUTRAL ATOMS WITH RESONANT MICROWAVE-RADIATION [J].
AGOSTA, CC ;
SILVERA, IF ;
STOOF, HTC ;
VERHAAR, BJ .
PHYSICAL REVIEW LETTERS, 1989, 62 (20) :2361-2364
[2]   PREPARATION OF A PURE INTENSE BEAM OF METASTABLE HELIUM BY LASER COOLING [J].
ASPECT, A ;
VANSTEENKISTE, N ;
KAISER, R ;
HABERLAND, H ;
KARRAIS, M .
CHEMICAL PHYSICS, 1990, 145 (02) :307-315
[3]   ELECTRON-SPECTROSCOPY OF SURFACES BY IMPACT OF METASTABLE HE ATOMS - CO ON PD(110) [J].
CONRAD, H ;
ERTL, G ;
KUPPERS, J ;
SESSELMANN, W ;
HABERLAND, H .
SURFACE SCIENCE, 1982, 121 (01) :161-180
[4]   ENERGY-DISTRIBUTIONS OF TRAPPED ATOMIC-HYDROGEN [J].
DOYLE, JM ;
SANDBERG, JC ;
MASUHARA, N ;
YU, IA ;
KLEPPNER, D ;
GREYTAK, TJ .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1989, 6 (11) :2244-2248
[5]   OPTICAL COOLING OF ATOMIC-HYDROGEN IN A MAGNETIC TRAP [J].
HIJMANS, TW ;
LUITEN, OJ ;
SETIJA, ID ;
WALRAVEN, JTM .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1989, 6 (11) :2235-2243
[6]   DIRECT DEMONSTRATION OF SPIN-ANGULAR-MOMENTUM CONSERVATION IN REACTION HE(23S1)+HE(23S1)-]HE(11SO)+HE++E- [J].
HILL, JC ;
HATFIELD, LL ;
WALTERS, GK ;
STOCKWELL, ND .
PHYSICAL REVIEW A-GENERAL PHYSICS, 1972, 5 (01) :189-+
[7]   COLLISIONS OF ULTRACOLD TRAPPED ATOMS [J].
JULIENNE, PS ;
MIES, FH .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1989, 6 (11) :2257-2269
[8]  
JULIENNE PS, 1991, ADV AT MOL OPT PHYS, V30, P141
[9]  
KAISER R, 1990, THESIS ECOLE NORMALE
[10]  
KUMAKURA M, 1982, JPN J APPL PHYS, V31, pL276