Dissertation > Excellent graduate degree dissertation topics show

Investigation of Collisional Transfer in Excited Atoms by Applying Laser Absorption and Fluorescence Method

Author: QinChen
Tutor: ShenYiFan
School: Xinjiang University
Course: Optics
Keywords: Collisional energy transfer Fluorescence Rate coefficient Fine structure Quenching
CLC: O562
Type: Master's thesis
Year: 2007
Downloads: 45
Quote: 1
Read: Download Dissertation

Abstract


Collisional energy transfer in atoms and molecules can proved sighted into molecular interaction potential, energy distribute and new LASER development. Since the excited states of alkali atoms and molecules are low , it can be excited easyly, the fluorescence lie to infrared. Additionally since the density of alkali atomic energy levels approaches the point where almost continuous tuning may be achieved. They offer the possibility of newly high-power quasitunable lasers in the short-wave infrared.The domestic and international scholars are very interested in and pay much attention to it in recent years.In this thesis, we focus on studying collisional energy transfer process between excited states of alkali atoms and gas molecules by the technique of laser induce fluorescence spectroscopy and the theory of fluorescent rate equation .(1) The collisional energy transfer process Rb(5 PJ )+(He,N2) under gas cell conditions has been investigated. Using a rate equation model, we obtained the transfer rate coefficient for 5 P3 2→5P1 2transfer in collision with He is 2.23×10-12cm3s-1; with N2 is4.38×10-11 cm3s-1. The quenching rate coefficient out of the 5 PJ state is 5.45×10-11cm3s-1. The results are compared with other experiments.(2) Applying the CW laser absorption and fluorescence method, the cross sections for the fine structure mixing and quenching of the Cs(6P ) state, induced by collision with Ne atoms, have been measured.The result of this thesis areσ3/2→1 /2=(1.90±0.82)×10-19cm2 andσD=(8.97±3.85)×10-19cm2 .The precision of this experiment was enhanced because better dealed with radiation trapping.

Related Dissertations

  1. Flexible,rigid,Synthesis and characterization of mixed ligand complexes,O621.1
  2. Characterization and Identification of Maturity of Pig Manure Composting,S141.4
  3. Indirect Imaging of Singlet Oxygen Generation from a Single Cell,Q2-3
  4. Evaluation of Photosynthetic Efficiancy of Seedlings of the Hybrid Progenies (F1) in Peach,S662.1
  5. Some Fluorescence Quenching Spectral Analysis Interacted with Bio-related Molecules,X832
  6. Quantifying the Responses of Weak Gluten Wheat Leaf Photosynthesis and Chlorophyll Fluorescence Parameters to Weak Light at Filling Stage,S512.1
  7. Effects of Two Kinds of Zinc Form on Expression of Zinc Transporter Gene SLC39A1 to 3 in Dairy Goat,S827
  8. Syntheses, Structures and Properties of Metal-organic Frameworks Based on Dicarboxylate Ligands,O621.13
  9. Studies on the Interaction between Biomolecules by Surface Plasmon Resonance Technology and Fluorescence Spectrometry,Q503
  10. The Impact of Histone Deacetylase Inhibitor Trichostatin a on Proliferation and Apoptosis of Porcine Granulosa Cells,S828
  11. Polycyclic aromatic hydrocarbons degradation of the growth characteristics of bacteria in soil remediation,X172
  12. Clonal Origin of Multifocal Clear Cell Renal Cellcarcinoma Studied by Fluorescence in Situ Hybridization,R737.11
  13. The Study on Clinical Using of FISH and Cytology in Diagnosis and Surveillance of Recurrence in UC,R737.1
  14. Containing pyrazoline chromophore small molecule and polymer synthesis and fluorescent properties of,O631.3
  15. Anthracycline- DNA Interactions,R96
  16. Syntheses, Structures and Properties of Metal-organic Coordination Polymers Based on Long-Chain Aromaticmulticarboxylate,O631.3
  17. Syntheses and Characterizations of Coordination Polymers Containing Bis-imidazole Ligands,O633.5
  18. Fluorescent Enhancement of Guest Molecules by Supramolecular Hydrogel,O648.17
  19. Expression Analysis of Storage Protein Avenin-like B Gene Promoter from Wheat (Triticum Aestivum),S512.1
  20. Copper and chromium on the mechanism of toxicity and chlorella detoxification method,X173
  21. YAG: Ce 3 Preparation and luminescent properties of phosphor,TQ422

CLC: > Mathematical sciences and chemical > Physics > Molecular physics, atomic physics > Atomic Physics
© 2012 www.DissertationTopic.Net  Mobile