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Ionization energies of hypervalent Li 2 F, Li 2 Cl and Na 2 Cl molecules obtained by surface ionization electron impact neutralization mass spectrometry
Author(s) -
Nešković Olivera M.,
Veljković Miomir V.,
Veličković Suzana R.,
Petkovska Ljubica T.,
PerićGrujić Aleksandra A.
Publication year - 2002
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.896
Subject(s) - chemistry , hypervalent molecule , photoionization , ionization , molar ionization energies of the elements , thermal ionization , electron ionization , ionization energy , mass spectrometry , ion , atomic physics , chemical ionization , molecule , analytical chemistry (journal) , physics , organic chemistry , chromatography , reagent
Ionization energies of hypervalent Li 2 F, Li 2 Cl and Na 2 Cl molecules detected by surface ionization electron impact neutralization mass spectrometry are reported. The ionization energies were 3.78 ± 0.2 eV for Li 2 F, 4.93 ± 0.2 eV for Li 2 Cl, and 4.21 ± 0.2 eV for Na 2 Cl. The ionization energies (IE) agree with theoretical ionization energies calculated by ab initio methods,1 supporting the theoretical prediction that Li 2 F has a hyperlithiated configuration in which the odd electron delocalizes over the two lithiums and with photoionization measurement.2 The first ionization energy of Na 2 Cl was experimentally confirmed earlier3–7 and for Li 2 Cl as well.8 We have developed and used this new approach for the problem—in the present work ions were first formed by surface ionization, followed by electron attachment (neutralization). Copyright © 2002 John Wiley & Sons, Ltd.
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