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Negative ion photoelectron spectrosc...

Zheng, Weijun.

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Negative ion photoelectron spectroscopy of metal clusters, metal-organic clusters, metal oxides, and metal-doped silicon clusters.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Negative ion photoelectron spectroscopy of metal clusters, metal-organic clusters, metal oxides, and metal-doped silicon clusters./
Author:	Zheng, Weijun.
Description:	333 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6416.
Contained By:	Dissertation Abstracts International65-12B.
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3155718
ISBN:	0496165240

Negative ion photoelectron spectroscopy of metal clusters, metal-organic clusters, metal oxides, and metal-doped silicon clusters.
Zheng, Weijun.

Negative ion photoelectron spectroscopy of metal clusters, metal-organic clusters, metal oxides, and metal-doped silicon clusters. - 333 p.

Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6416.

Thesis (Ph.D.)--The Johns Hopkins University, 2005.

The techniques of time-of-flight mass spectrometry and negative ion photoelectron spectroscopy were utilized to study metal clusters (Mgn -, Znn-, Can -, Mnn-, CuAln -, LiAln-, and NmSn n-), metal-organic complexes (Tin(benzene) m-, Fn(benzene)m- , Nin(benzene)m-), metal oxides(AuO-, PtO-, TaOn -, HfO2-, and MnnO -), and metal-doped semiconductor clusters (CrSin -, GdmSin- and HoSi n-).

ISBN: 0496165240Subjects--Topical Terms:

560527
Chemistry, Physical.

Negative ion photoelectron spectroscopy of metal clusters, metal-organic clusters, metal oxides, and metal-doped silicon clusters.
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100 1 $a Zheng, Weijun. $3 1901958
245 1 0 $a Negative ion photoelectron spectroscopy of metal clusters, metal-organic clusters, metal oxides, and metal-doped silicon clusters.
300 $a 333 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6416.
500 $a Adviser: Kit H. Bowen, Jr.
502 $a Thesis (Ph.D.)--The Johns Hopkins University, 2005.
520 $a The techniques of time-of-flight mass spectrometry and negative ion photoelectron spectroscopy were utilized to study metal clusters (Mgn -, Znn-, Can -, Mnn-, CuAln -, LiAln-, and NmSn n-), metal-organic complexes (Tin(benzene) m-, Fn(benzene)m- , Nin(benzene)m-), metal oxides(AuO-, PtO-, TaOn -, HfO2-, and MnnO -), and metal-doped semiconductor clusters (CrSin -, GdmSin- and HoSi n-).
520 $a The study of magnesium and zinc cluster anions shows that they have magic numbers at size 9, 19 and 34, and the closures and reopenings of the s-p band gap are related to the mass spectra magic numbers. The evolution of electronic structure in Can clusters resembles that of Mgn - and Znn- with band gap closure and reopening. However, the electronic structures Can- clusters are more complicated and the magic numbers are different from those of Mgn- and Znn -. That might due to the involvement of calcium's empty d orbitals. In Mn clusters, a dramatic change of electronic structure was observed at Mn5-. The transition of metallic and magnetic properties is strongly related to the s-d hybridization.
520 $a The photoelectron study of LiAln- is consistent with theoretical predictions, which described LiAl13 as alkali-halide-like ionic entity, Li+(Al13)-. The results of CuAln- show that copper atom might occupy interior position in these clusters. The results of Nam Snn- implied that Na4Sn 4 and NaSn5- could be described as (Na +)4Sn44- and (Na +)Sn52-, respectively. The formation of these species indicates the existence of Zintl phase structure in the gas phase.
520 $a Tin(Bz)n+1- clusters have multiple-decker sandwich structures with each titanium atom located between two parallel benzene rings. The structures of Fen(Bz)m - and Nin(Bz)m- are characterized with a metal cluster core caged by benzene molecules.
520 $a The information for the electronic states of PtO, AuO, and TaOn (n = 1--3) were obtained from the photoelectron spectra of their corresponding negative ions. The coincidence between electron affinity and thermodynamic stability was observed in the investigation of ZrO2 - and HfO2-. The studies of MnnO- revealed that addition of oxygen atom could change the magnetic momentum and magnetic coupling in the Mn clusters.
520 $a The photoelectron spectra of CrSin- (n = 8--12) support the earlier theoretical calculations which found CrSi 12 to be an enhanced stability cluster with its chromium atom encapsulated inside a silicon cage and with its magnetic moment completely quenched by the effects of the surrounding cage. The preliminary results of GdSi n- show that GdSi4, GdSi6 and GdSi9 might be different from their counterparts.
590 $a School code: 0098.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Physics, Molecular. $3 1018648
690 $a 0494
690 $a 0609
710 2 0 $a The Johns Hopkins University. $3 1017431
773 0 $t Dissertation Abstracts International $g 65-12B.
790 1 0 $a Bowen, Kit H., Jr., $e advisor
790 $a 0098
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3155718