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TiN的真空能级结构是怎么样的【有效期至2008年12月30日】
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TiN的真空能级结构是怎么样的，或者能级结构结构怎么样计算【有效期至2008年12月30日】 [ Last edited by glore on 2008-8-29 at 17:12 ] |
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中文名称： 四能级系统共振荧光谱与Na,Na2,TiN,ZrN激光光谱研究 英文名称： Study on resonant fluorescence spectra of the four-level system and Na-Na2 system,TiN and ZrN laser spectroscopy 学位类型： 博士毕业论文 作者： 李永放 著 导师： 毕业学校： 西安交通大学 专业： 物理电子学与光电子学 毕业年份： 2001 关键字： 激光光谱 吸收光谱 共振荧光谱 四能级原子系统 量子干涉 激光 光谱 |
2楼2008-08-29 15:58:56
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Abstract In this paper, the resonance fluorescence spectra, absorption spectra and the stimulated emission spectra of the atom and the molecule are discussed theoretically and experimentally. The paper is divided into three parts. In the first part, we present a new model of the four-level system driven by two coherent fields, which has never been discussed before. The resonance fluorescence spectra and the various phenomena associated with the quantum interference are investigated. Then, in the second part, the radiation of the atom and the molecule in the process of the collision excitation of the sodium atom-molecule is studied. Finally, the transition spectra of the electronic states of the TiN and ZrN using the high-resolution laser induced fluorescence spectroscopy technology are studied Part One: Quantum interference results in a variety of new physics effects, which are attracting much current interest. This paper presents a new model of four-level system, which is driven by two coherent fields and investigated many novel and interesting results. 1) In our double-driven four level system, we obtain the ac-stark splitting in terms of the numerical results for the first time. We study the ac-stark splitting in deferent conditions and find that when the system is driven by a single driving field, the ac-stark cannot appear. Furthermore, vary the different driven field can lead to different change of the ac-stark effect. We also explain successfully the effect utilizing the dressed theory. 2) In our double-driven four-level system, we obtained three ultra-sharp peaks in the resonance fluorescence spectra for the first time. The three ultra-narrow spectral lines in the spontaneous emission spectra from upper level to lower-lying levels occur over a wide range of the parameters. The appearance of the three ultra-narrow spectral lines is closely dependent on Rabi frequency of two coherence-driving fields and the larger of the Rabi frequency, the more narrow of the lines. The effect of the narrowing lines doesn't yield as only have a coherence-driving field. But incoherent transition and the collisional decay between the energy levels destroy the feature of the spectral narrowing. Therefore, All the results demonstrate that the generation of the ultra-sharp spectra is closely associated with the quantum interference. 3) In this paper, we study the CPT and EIT effects with the help of the first-order approximately density matrix diagonal elements non-diagonal elements, which are proportion to their absorption and dispersion spectra of the system, respectively. We investigate CPT and EIT effects and discuss the population distribution of the each level, absorption and dispersion profiles in the three-level system driven by a single coherent field、three-level A-system driven by two coherent fields and four-level atom driven by two coherent fields. The quantum interference between two excited pathways results in two transparency holes、narrow resonances and population transfer with adjustable frequencies driven into the absorption spectrum in the four-level system for the first time. The rules of the CPT and EIT effects are compared with various systems. The origins of the various physics phenomena are discussed. 4) Using the linear response theory, we investigate the absorption spectra of weak probe filed for a four-level system and obtain some new physics phenomena including double CPT and double EIT, double-lasing without inversion, which are obtained in the four-level system for the first time. 5) We report the experimental observations of the dips in excitation spectra of the atomic sodium D〓 line and analyze theoretically and calculate numerically the excitation spectra of the atomic sodium D〓 line in the three-level-system in detail. The rule of the excitation spectra and the mechanism of the phenomena are described. We find the dips are closely associated with the quantum interference. 6) We present a configuration of the diamond four-level, in which consist of V-three-level and an upper excited state. The existence of the Rabi frequency driven upper excitation level from the doublet-level affects the absorption spectra of the V-system and the width of the coherent trapping state, but does not affect the generation of the coherent trapping state. The very narrow EIT is obtained with large Rabi frequency. If the excited way is different, the position of the coherent trapping state is also different. Part Two: Many experiments and theory have shown that the collision impact greatly on the radiations of atoms and molecules. We study various radiations with different excitation mechanisms that are correlative with collision. 1) Using cw laser two-photon excitation atomic sodium to 4D state and then the triplet and single states of the dimer were populated by the collision energy transfer process, the violet diffuse bands stimulation radiation and fluorescence were observed. The experiment results show that the argon gas is beneficial for the energy transfer process under certain pressure of argon and the population and stimulation radiation are also quenched in the higher pressure, but the fluorescence emission can be enhanced in the proper pressure of the Argon. 2) The energy-pooling (EP) collision process is very complex. Many works have been done for the process of EP collision without any other atom taking part in. We investigate EP collision process of sodium assisted argon atom in detail. The stimulation radiation of violet region for the atomic sodium and dimer of triplet state were observed. The experiment results show that the angle momentum plays a role in the population process of high-lying states. The experiment results are fitted with temporal rate equations. 3) Using the hybrid-resonant excitation excited Na to 4D state from 3S state in the Na-Na〓 system. The profile of the infrared stimulation radiation signal observed in the experiment was odd. These results will be discussed in the future. Part Three: Using high resolution laser induced fluorescence (LIF) spectroscopy technology, we study the B〓∑〓-X〓∑〓 transitions of molecules of the TiN, ZrN. 1) The B〓∑〓-X〓∑〓 (0, 0) and (1, 0) bands of TiN between 410.3 and 427. 3nm were recorded using high resolution laser induced fluorescence (LIF) spectroscopy and these bands have been rotationally analyzed. No rotational perturbation was detected in the (0, 0) band, however, four rotational perturbations have been found in the (1, 0) band. These perturbation could be ascribed to a 〓∑〓 perturbing state interacting with the B〓∑〓 state, which was reported for the first time. Least-squares fits of the line positions observed yielded molecular constants for the v=0 and 1 level of the B〓∑〓 and X〓∑〓 states, and the perturbing 〓∑〓 state. The B〓∑〓-X〓∑〓 transition of the isotopes 〓TiN, 〓TiN were also recorded. 2) The ZrN is similar to TiN, we observed the violet signal of B〓∑〓-X〓∑〓 transition of the ZrN and recorded the positions of the perturbation. |
3楼2008-08-29 15:59:55