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Electronic Transitions of Transition Metal Monoboride and Monoxides

Electronic Transitions of Transition Metal Monoboride and Monoxides PDF Author: NA. WANG
Publisher:
ISBN: 9781361370407
Category :
Languages : en
Pages :

Book Description
This dissertation, "Electronic Transitions of Transition Metal Monoboride and Monoxides" by Na, Wang, 王娜, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled ELECTRONIC TRANSITIONS OF TRANSITION METAL MONOBORIDE AND MONOXIDES Submitted by WANG NA For the degree of Doctor of Philosophy at The University of Hong Kong in December 2014 This thesis reports the study of electronic transitions of transition metal monoboride and monoxides using the technique of laser ablation/reaction free jet expansion with laser‒induced fluorescence (LIF) spectroscopy and optical‒optical double resonance (OODR) spectroscopy. The molecules of interest in this investigation include the ruthenium monoboride (RuB), ruthenium monoxide (RuO), scandium monoxide (ScO) and yttrium monoxide (YO) molecules. The RuB and RuO were produced by reacting the ruthenium metal atoms generated using laser ablation with 0.5% diborane (B H ) and 6% nitrous oxide (N O) seeded in argon respectively, 2 6 2 and the ScO and YO molecules were generated with their corresponding metal atoms with 10% oxygen (O ) seeded in argon. Electronic transition spectra of these molecules were recorded using tunable pulsed dye laser and optical parametric oscillator (OPO) laser systems. 2 For the RuB molecule, three vibrational bands of the [18.4]2.5 ‒ X Δ 5/2 electronic transition systems were recorded and rotationally analyzed using LIF spectroscopy in the visible region. The bond length r and ΔG of ground state of o 1/2 -1 RuB molecule were determined to be 1.7099 A and 911.02 cm, respectively. This research represents the first experimental study of the RuB molecule. Using LIF spectroscopy, four electronic transition systems of the RuO molecule were observed 5 5 and analyzed, which include the [18.1] Ω = 4 - X Δ, [16.0] Ω = 5 - X Δ, [18.1] Ω = 4 4 5 5 3 - X Δ, and [15.8] Ω = 4 - X Δ systems. The ground state was confirmed to be a 3 3 X Δ state and the bond length of upper states were also determined. For the ScO molecule, ten vibrational bands were observed in the region between 280 and 320 nm 2 + via the intermediate B Σ electronic state using OODR spectroscopy, seven of them 2 + 2 + belong to four transition systems namely: [33.41]0.5 - B Σ, [32.92]1.5 - B Σ, 4 + 2 + 2 + 2 + [32.85] Σ - B Σ and [34.00] Σ - B Σ systems. This is the first time a quartet electronic state of the ScO molecule has been identified and studied. Similar to the 2 + ScO molecule, twelve vibrational bands were observed via the intermediate B Σ electronic state. These transitions were analyzed and classified into four transition 2 + 2 + 2 + 2 + 4 - systems including Ω = 0.5 - B Σ, Ω = 1.5 - B Σ, [34.1] Σ - B Σ and [33.7] Σ - 2 + B Σ systems. Molecular constants for the observed electronic states of these molecules were determined by least squares fitting of the measured resolved rotational lines. Furthermore, molecular orbital energy level diagrams were constructed to explain the studied electronic states and the electronic structure of these molecules. DOI: 10.5353/th_b5387996 Subjects: Transition metal oxides Transition metal compounds Borides

Electronic Transitions of Transition Metal Monoboride and Monoxides

Electronic Transitions of Transition Metal Monoboride and Monoxides PDF Author: NA. WANG
Publisher:
ISBN: 9781361370407
Category :
Languages : en
Pages :

Book Description
This dissertation, "Electronic Transitions of Transition Metal Monoboride and Monoxides" by Na, Wang, 王娜, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled ELECTRONIC TRANSITIONS OF TRANSITION METAL MONOBORIDE AND MONOXIDES Submitted by WANG NA For the degree of Doctor of Philosophy at The University of Hong Kong in December 2014 This thesis reports the study of electronic transitions of transition metal monoboride and monoxides using the technique of laser ablation/reaction free jet expansion with laser‒induced fluorescence (LIF) spectroscopy and optical‒optical double resonance (OODR) spectroscopy. The molecules of interest in this investigation include the ruthenium monoboride (RuB), ruthenium monoxide (RuO), scandium monoxide (ScO) and yttrium monoxide (YO) molecules. The RuB and RuO were produced by reacting the ruthenium metal atoms generated using laser ablation with 0.5% diborane (B H ) and 6% nitrous oxide (N O) seeded in argon respectively, 2 6 2 and the ScO and YO molecules were generated with their corresponding metal atoms with 10% oxygen (O ) seeded in argon. Electronic transition spectra of these molecules were recorded using tunable pulsed dye laser and optical parametric oscillator (OPO) laser systems. 2 For the RuB molecule, three vibrational bands of the [18.4]2.5 ‒ X Δ 5/2 electronic transition systems were recorded and rotationally analyzed using LIF spectroscopy in the visible region. The bond length r and ΔG of ground state of o 1/2 -1 RuB molecule were determined to be 1.7099 A and 911.02 cm, respectively. This research represents the first experimental study of the RuB molecule. Using LIF spectroscopy, four electronic transition systems of the RuO molecule were observed 5 5 and analyzed, which include the [18.1] Ω = 4 - X Δ, [16.0] Ω = 5 - X Δ, [18.1] Ω = 4 4 5 5 3 - X Δ, and [15.8] Ω = 4 - X Δ systems. The ground state was confirmed to be a 3 3 X Δ state and the bond length of upper states were also determined. For the ScO molecule, ten vibrational bands were observed in the region between 280 and 320 nm 2 + via the intermediate B Σ electronic state using OODR spectroscopy, seven of them 2 + 2 + belong to four transition systems namely: [33.41]0.5 - B Σ, [32.92]1.5 - B Σ, 4 + 2 + 2 + 2 + [32.85] Σ - B Σ and [34.00] Σ - B Σ systems. This is the first time a quartet electronic state of the ScO molecule has been identified and studied. Similar to the 2 + ScO molecule, twelve vibrational bands were observed via the intermediate B Σ electronic state. These transitions were analyzed and classified into four transition 2 + 2 + 2 + 2 + 4 - systems including Ω = 0.5 - B Σ, Ω = 1.5 - B Σ, [34.1] Σ - B Σ and [33.7] Σ - 2 + B Σ systems. Molecular constants for the observed electronic states of these molecules were determined by least squares fitting of the measured resolved rotational lines. Furthermore, molecular orbital energy level diagrams were constructed to explain the studied electronic states and the electronic structure of these molecules. DOI: 10.5353/th_b5387996 Subjects: Transition metal oxides Transition metal compounds Borides

Electronic Transitions of Transition Metal Monoboride and Monoxides

Electronic Transitions of Transition Metal Monoboride and Monoxides PDF Author: 王娜
Publisher:
ISBN:
Category : Borides
Languages : en
Pages : 0

Book Description


Electronic Transitions of Transition Metal Monoborides

Electronic Transitions of Transition Metal Monoborides PDF Author: 吳育煒
Publisher:
ISBN:
Category : Borides
Languages : en
Pages : 0

Book Description


Electronic Transitions of Transition Metal Monoborides

Electronic Transitions of Transition Metal Monoborides PDF Author: Yuk-Wai Ng
Publisher: Open Dissertation Press
ISBN: 9781361330739
Category :
Languages : en
Pages :

Book Description
This dissertation, "Electronic Transitions of Transition Metal Monoborides" by Yuk-wai, Ng, 吳育煒, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b5153703 Subjects: Transition metal compounds Borides

Electronic Spectra of Transitions Metal Complexes

Electronic Spectra of Transitions Metal Complexes PDF Author: Vinod Jena
Publisher: Lulu.com
ISBN: 1329059875
Category : Reference
Languages : en
Pages : 93

Book Description
This books will provides a conceptual parts of Electronic spectra of various transition metal complexes, which is useful for various competitive examinations.

The Electronic Properties of the Transition-metal Monoxides

The Electronic Properties of the Transition-metal Monoxides PDF Author: Belita Koiller
Publisher:
ISBN:
Category : Electronic structure
Languages : en
Pages : 186

Book Description


Transition Metal Oxides

Transition Metal Oxides PDF Author: P.A. Cox
Publisher: Oxford University Press
ISBN: 0199588945
Category : Science
Languages : en
Pages : 295

Book Description
Transition metal oxides form a series of compounds with a uniquely wide range of electronic properties. The main aim of this book is to describe the varied electronic behaviour shown by transition metal oxides, and to discuss the different types of theoretical models that have been proposed to interpret this behaviour.

Transition Metal Compounds

Transition Metal Compounds PDF Author: Daniel I. Khomskii
Publisher: Cambridge University Press
ISBN: 1316060802
Category : Science
Languages : en
Pages : 501

Book Description
Describing all aspects of the physics of transition metal compounds, this book provides a comprehensive overview of this unique and diverse class of solids. Beginning with the basic concepts of the physics of strongly correlated electron systems, the structure of transition metal ions, and the behaviours of transition metal ions in crystals, it goes on to cover more advanced topics such as metal-insulator transitions, orbital ordering, and novel phenomena such as multiferroics, systems with oxygen holes, and high-Tc superconductivity. Each chapter concludes with a summary of key facts and concepts, presenting all the most important information in a consistent and concise manner. Set within a modern conceptual framework, and providing a complete treatment of the fundamental factors and mechanisms that determine the properties of transition metal compounds, this is an invaluable resource for graduate students, researchers and industrial practitioners in solid state physics and chemistry, materials science, and inorganic chemistry.

Electronic Transitions in F-electron Metals at High Pressures

Electronic Transitions in F-electron Metals at High Pressures PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 11

Book Description
This study was to investigate unusual phase transitions driven by electron correlation effects that occur in many f-band transition metals and are often accompanied by large volume changes: ≈20% at the [delta]-[alpha] transition in Pu and 5-15% for analogous transitions in Ce, Pr, and Gd. The exact nature of these transitions has not been well understood, including the short-range correlation effects themselves, their relation to long-range crystalline order, the possible existence of remnants of the transitions in the liquid, the role of magnetic moments and order, the critical behavior, and dynamics of the transitions, among other issues. Many of these questions represent forefront physics challenges central to Stockpile materials and are also important in understanding the high-pressure behavior of other f- and d-band transition metal compounds including 3d-magnetic transition monoxide (TMO, TM=Mn, Fe, Co, Ni). The overarching goal of this study was, therefore, to understand the relationships between crystal structure and electronic structure of transition metals at high pressures, by using the nation's brightest third-generation synchrotron x-ray at the Advanced Photon Source (APS). Significant progresses have been made, including new discoveries of the Mott transition in MnO at 105 GPa and Kondo-like 4f-electron dehybridization and new developments of high-pressure resonance inelastic x-ray spectroscopy and x-ray emission spectroscopy. These scientific discoveries and technology developments provide new insights and enabling tools to understand scientific challenges in stockpile materials. The project has broader impacts in training two SEGRF graduate students and developing an university collaboration (funded through SSAAP).

Transition Metals in the Synthesis of Complex Organic Molecules

Transition Metals in the Synthesis of Complex Organic Molecules PDF Author: Louis S. Hegedus
Publisher: University Science Books
ISBN: 9781891389047
Category : Science
Languages : en
Pages : 358

Book Description
This second edition offers easy access to the field of organotransition metal chemistry. The book covers the basics of transition metal chemistry, giving a practical introduction to organotransition reaction mechanisms.