A 4 pi recoil-ion electron momentum analyzer: A high-resolution ''microscope'' for the investigation of the dynamics of atomic, molecular and nuclear reactions

被引:195
作者
Moshammer, R [1 ]
Unverzagt, M [1 ]
Schmitt, W [1 ]
Ullrich, J [1 ]
SchmidtBocking, H [1 ]
机构
[1] UNIV FRANKFURT, INST KERNPHYS, D-60486 FRANKFURT, GERMANY
关键词
D O I
10.1016/0168-583X(95)01259-1
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A high-resolution recoil-ion momentum spectrometer based on a precooled localized supersonic jet target (COLTRIMS) has been combined with a novel low-energy electron analyzer with 4 pi solid angle for electrons with energies E(e) less than or similar to 30 eV including E(e) = 0 eV. Thus, three recoil-ion momentum components, the recoil-ion charge state and three momentum components of one electron emitted in any collision-induced ionization reaction are measured simultaneously with a coincidence efficiency of 28%. In order to accept large recoil-ion longitudinal momenta (along the beam) of p(R parallel to) less than or equal to 160 a.u. and simultaneously guarantee a superior resolution in this direction (Delta P-R parallel to less than or equal to +/-0.08 a.u.), recoil ions are extracted in the longitudinal direction different from all former concepts. Test measurements, details on the present design and results of a kinematically complete experiment for single ionization are presented and possible further improvements are discussed. The future potential of such spectrometers for the investigation of collision-induced atomic many-particle reactions, the ''Coulomb-explosion'' of molecules and the spectroscopy of electronic states in heavy few-electron systems is illustrated. Similar techniques might be used to measure angular correlations and even the neutrino mass in P-decay experiments.
引用
收藏
页码:425 / 445
页数:21
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