Related Experiment Video
Updated: May 27, 2026
08:53
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
Electronic transitions of cobalt monoboride
Y W Ng1, H F Pang, A S-C Cheung
1Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong.
The Journal of Chemical Physics
|December 2, 2011
Summary
This study presents the first experimental electronic spectrum of cobalt monoboride (CoB) molecules. Researchers analyzed visible light transitions, revealing details about CoB
Area of Science:
- Molecular Spectroscopy
- Quantum Chemistry
- Materials Science
Background:
- Cobalt monoboride (CoB) is a diatomic molecule with limited spectroscopic data.
- Understanding the electronic structure of transition metal borides is crucial for materials science applications.
Purpose of the Study:
- To experimentally investigate the electronic transition spectrum of CoB in the visible region.
- To characterize the electronic states and molecular properties of CoB.
- To provide the first experimental data on the CoB spectrum.
Main Methods:
- Laser-induced fluorescence spectroscopy was employed to observe the CoB spectrum.
- CoB molecules were generated via laser ablation of cobalt in the presence of diborane.
- Fifteen vibrational bands with resolved rotational structure were analyzed for Co(10)B and Co(11)B isotopes.
Main Results:
- Four distinct transition systems were assigned, including [18.1](3)Π(2)-X(3)Δ(2) and others.
- The bond length of the X(3)Δ(3) state of CoB was determined to be 1.705 Å.
- Unresolved hyperfine structure indicated adherence to Hund's case (a(β)) coupling.
Conclusions:
- This research provides the foundational experimental electronic spectrum of cobalt monoboride.
- The study elucidates the electronic transitions and molecular constants of CoB.
- The findings establish a basis for future theoretical and experimental studies on CoB and related compounds.
More Related Videos
Related Concept Videos
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
02:45Valence Bond Theory
Overview of Valence Bond Theory
02:58Properties of Transition Metals
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
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 process,...
02:32Bonding in Metals
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.