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Photoelectron and photoionization spectroscopy of weakly bound aluminum-methylamine complexes

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Photoelectron and photoionization spectroscopy of weakly bound aluminum-methylamine complexes

Auteurs : RBID : Pascal:03-0219401

Descripteurs français

Pascal (Inist)
- 3360, 3380E, 3115A, 3115E, 3315M, 3320T, Etude expérimentale, Aluminium composé, Spectre photoélectron, Photoionisation, Constante force moléculaire, Méthode fonctionnelle densité, Calcul ab initio, Etat fondamental, Mécanique intermoléculaire, Etat excité.

English descriptors

KwdEn :
- Ab initio calculations, Aluminium compounds, Density functional method, Excited states, Experimental study, Ground states, Intermolecular mechanics, Molecular force constants, Photoelectron spectra, Photoionization.

Abstract

Aluminum-methylamine complexes are produced in pulsed molecular beams. Their electronic spectra are obtained using threshold photoionization and zero-electron-kinetic-energy photoelectron spectroscopies and interpreted using density functional and ab initio calculations. The photoelectron spectra reveal ground electronic states and intermolecular and ligand-based vibrations of Al-NH_n(CH₃)_3-n and Al⁺-NH_n(CH₃)_3-n(n=0-2), adiabatic ionization energies of Al-NH_n(CH₃)_3-n, and a low-lying excited electronic state of Al-NH₂CH₃. In addition, the spectroscopic measurements and theoretical calculations show strong methyl substitution effects on the ionization energies and metal-ligand binding. Striking spectral differences are discovered between these aluminum complexes and previously studied gallium and indium analogues. © 2003 American Institute of Physics.

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Le document en format XML

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<author><name sortKey="Li, Shenggang" uniqKey="Li S">Shenggang Li</name>
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<author><name sortKey="Rothschopf, Gretchen K" uniqKey="Rothschopf G">Gretchen K. Rothschopf</name>
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<author><name sortKey="Fuller, Jason F" uniqKey="Fuller J">Jason F. Fuller</name>
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<author><name sortKey="Yang, Dong Sheng" uniqKey="Yang D">Dong-Sheng Yang</name>
<affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055</s1>
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<front><div type="abstract" xml:lang="en">Aluminum-methylamine complexes are produced in pulsed molecular beams. Their electronic spectra are obtained using threshold photoionization and zero-electron-kinetic-energy photoelectron spectroscopies and interpreted using density functional and ab initio calculations. The photoelectron spectra reveal ground electronic states and intermolecular and ligand-based vibrations of Al-NH<sub>n</sub>
(CH<sub>3</sub>
)<sub>3-n</sub>
 and Al<sup>+</sup>
-NH<sub>n</sub>
(CH<sub>3</sub>
)<sub>3-n</sub>
(n=0-2), adiabatic ionization energies of Al-NH<sub>n</sub>
(CH<sub>3</sub>
)<sub>3-n</sub>
, and a low-lying excited electronic state of Al-NH<sub>2</sub>
CH<sub>3</sub>
. In addition, the spectroscopic measurements and theoretical calculations show strong methyl substitution effects on the ionization energies and metal-ligand binding. Striking spectral differences are discovered between these aluminum complexes and previously studied gallium and indium analogues. © 2003 American Institute of Physics.</div>
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(CH<sub>3</sub>
)<sub>3-n</sub>
 and Al<sup>+</sup>
-NH<sub>n</sub>
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Photoelectron and photoionization spectroscopy of weakly bound aluminum-methylamine complexes

Photoelectron and photoionization spectroscopy of weakly bound aluminum-methylamine complexes

Descripteurs français

English descriptors

Abstract

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