Related Experiment Video
Updated: May 3, 2026
06:53
Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
Published on: July 27, 2018
7.5K
Alanate anion, AlH4(-): photoelectron spectrum and computations
J D Graham1, A M Buytendyk, X Zhang
1Department of Chemistry, Johns Hopkins University , Baltimore, Maryland 21218, United States.
The Journal of Physical Chemistry. A
|February 12, 2014
Summary
The alanate anion (AlH4-) was studied using photoelectron spectroscopy. Researchers measured its vertical detachment energy (VDE) to be 4.4 eV, providing insights into its electronic structure.
Area of Science:
- Physical Chemistry
- Quantum Chemistry
- Spectroscopy
Background:
- The alanate anion (AlH4-) is an important chemical species.
- Understanding its electronic properties is crucial for various applications.
- Previous theoretical studies have provided some insights, but experimental data is limited.
Purpose of the Study:
- To experimentally determine the vertical detachment energy (VDE) of the gas-phase alanate anion (AlH4-).
- To investigate the electronic transitions between the ground states of AlH4- and its neutral counterpart, AlH4.
- To compare experimental VDE values with theoretical computations.
Main Methods:
- Generation of gas-phase alanate anion (AlH4-) using a pulsed arc cluster ionization source.
- Measurement of the photoelectron spectrum of AlH4- using 193 nm photons.
- Theoretical computation of VDE values for comparison.
Main Results:
- The photoelectron spectrum of AlH4- exhibited a broad feature from 3.8 eV to over 5.3 eV.
- The experimental vertical detachment energy (VDE) of AlH4- was determined to be 4.4 eV.
- Experimental VDE values were compared with comprehensive theoretical calculations.
Conclusions:
- The study successfully measured the VDE of the alanate anion, providing crucial experimental data.
- The findings validate and refine theoretical models of AlH4- and AlH4.
- This research contributes to a deeper understanding of the electronic structure and stability of alanate species.
More Related Videos
09:40Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
Published on: February 14, 2014
13.2K
11:54Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
Published on: February 8, 2018
9.7K
Related Concept Videos
01:18π Molecular Orbitals of the Allyl Cation and Anion
3.5K
An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each...
3.5K
01:27π Molecular Orbitals of the Allyl Radical
2.9K
Allyl radicals are three-carbon conjugated systems. They are readily formed as intermediates in halogenation reactions of alkenes involving the addition of halogen to the allylic carbon instead of the double bond. As seen in allyl cations and anions, each of the three sp2-hybridized carbon atoms in allyl radicals has an unhybridized p orbital. These orbitals combine to give three π molecular orbitals.
The allyl systems have identical molecular orbitals but differ in the number of π...
The allyl systems have identical molecular orbitals but differ in the number of π...
2.9K
01:23Atomic Spectroscopy: Absorption, Emission, and Fluorescence
3.1K
Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
3.1K
02:38Electrophilic Addition to Alkynes: Halogenation
7.4K
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
7.4K
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
3.0K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
3.0K
03:06Alkali Metals
18.0K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
18.0K