Rapidly pulsed helium droplet source

被引：71

作者：

Pentlehner, Dominik ^{[1
]}

Riechers, Ricarda ^{[1
]}

Dick, Bernhard ^{[1
]}

Slenczka, Alkwin ^{[1
]}

Even, Uzi ^{[2
]}

Lavie, Nachum ^{[2
]}

Brown, Raviv ^{[2
]}

Luria, Kfir ^{[2
]}

机构：

[1] Univ Regensburg, Inst Phys & Theoret Chem, D-93053 Regensburg, Germany

[2] Tel Aviv Univ, Sackler Fac Exact Sci, Sch Chem, IL-69978 Tel Aviv, Israel

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2009年 / 80卷 / 04期

关键词：

Bose-Einstein condensation; cryostats; drops; helium; superfluidity; SPECTROSCOPY; MOLECULES; PHTHALOCYANINE; DYNAMICS; LINE;

D O I：

10.1063/1.3117196

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A pulsed valve connected to a closed-cycle cryostat was optimized for producing helium droplets. The pulsed droplet beam appeared with a bimodal size distribution. The leading part of the pulse consists of droplets suitable for doping with molecules. The average size of this part can be varied between 10(4) and 10(6) helium atoms, and the width of the distribution is smaller as compared to a continuous-flow droplet source. The system has been tested in a single pulse mode and at repetition rates of up to 500 Hz with almost constant intensity. The droplet density was found to be increased by more than an order of magnitude as compared to a continuous-flow droplet source.

引用

页数：9

共 25 条

[1] Photoelectron spectroscopy of cluster anions of naphthalene and related aromatic hydrocarbons [J].

Ando, Naoto ;

Mitsui, Masaaki ;

Nakajima, Atsushi .

JOURNAL OF CHEMICAL PHYSICS, 2008, 128 (15)

[2] Helium nanodroplet isolation rovibrational spectroscopy: Methods and recent results [J].

Callegari, C ;

Lehmann, KK ;

Schmied, R ;

Scoles, G .

JOURNAL OF CHEMICAL PHYSICS, 2001, 115 (22) :10090-10110

[3] Wave packet dynamics in triplet states of Na2 attached to helium Nanodroplets [J].

Claas, Patrick ;

Droppelmann, Georg ;

Schulz, Claus Peter ;

Mudrich, Marcel ;

Stienkemeier, Frank .

JOURNAL OF PHYSICAL CHEMISTRY A, 2007, 111 (31) :7537-7541

[4] Inhomogeneous line shape theory of electronic transitions for molecules embedded in superfluid helium droplets [J].

Dick, B ;

Slenczka, A .

JOURNAL OF CHEMICAL PHYSICS, 2001, 115 (22) :10206-10213

[5] Cooling of large molecules below 1 K and He clusters formation [J].

Even, U ;

Jortner, J ;

Noy, D ;

Lavie, N ;

Cossart-Magos, C .

JOURNAL OF CHEMICAL PHYSICS, 2000, 112 (18) :8068-8071

[6] Universal molecule injector in liquid helium: Pulsed cryogenic doped helium droplet source [J].

Ghazarian, V ;

Eloranta, J ;

Apkarian, VA .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2002, 73 (10) :3606-3613

[7] CLUSTER FORMATION IN EXPANDING SUPERSONIC JETS - EFFECT OF PRESSURE, TEMPERATURE, NOZZLE SIZE, AND TEST GAS [J].

HAGENA, OF ;

OBERT, W .

JOURNAL OF CHEMICAL PHYSICS, 1972, 56 (05) :1793-&

[8] Density of superfluid helium droplets [J].

Harms, J ;

Toennies, JP ;

Dalfovo, F .

PHYSICAL REVIEW B, 1998, 58 (06) :3341-3350

[9] Laser-induced fluorescence spectroscopy of van der Waals complexes of tetracene-ArN (N≤5) and pentacene-Ar within ultracold liquid He droplets [J].

Hartmann, M ;

Lindinger, A ;

Toennies, JP ;

Vilesov, AF .

CHEMICAL PHYSICS, 1998, 239 (1-3) :139-149

[10] Condensation limited cooling in supersonic expansions [J].

Hillenkamp, M ;

Keinan, S ;

Even, U .

JOURNAL OF CHEMICAL PHYSICS, 2003, 118 (19) :8699-8705

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