PHYS07200604007 Manas Kumar Dala - Homi Bhabha National ...

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Experimental Techniques 30 Figure 2.3: ”Universal curve” for electron inelastic mean free path λ. of 20 to 200 eV. And hence the surface sensitivity of photoemission spectroscopy is highest in this energy range. 2.2.4 Experimental set-up The OMICRON photoemission system at Institute of Physics consists of two connected UHV chambers, a sample preparation chamber and an analysis chamber. The preparation chamber is equipped with a precision manipulator, sample heater, evaporator and a diamond file. The analysis chamber is made up of µ metal to protect low energy electrons from earth’s magnetic field and stray magnetic fields. It is equipped with a 125 mm hemispherical analyser [10] for angle integrated photoemission and a movable 65 mm hemispherical analyser mounted on a 2-axis goniometer is also there for angle resolved photoemission. Two photon sources [10, 14] (ultra-violet and x-ray) are used for photoexcitations. The analysis chamber is also equipped with a 4-axis sample manipulator-cum cryostat which can go down to 20 K. Facility for performing low energy electron diffraction (LEED) is also available in the analysis chamber. The external view of the spectrometer is shown in the Fig. 2.4. Some of the important components of the spectrometer are described below.
Experimental Techniques 31 Figure 2.4: Photoemission spectrometer at Institute of Physics, Bhubaneswar.
Page 1 and 2: SPECTROSCOPIC INVESTIGATIONS OF THE
Page 3 and 4: iii To My Parents
Page 5 and 6: Maharana, P. Khare, D. K. Basa, K.
Page 7 and 8: List of Publications/Preprints [1]
Page 9 and 10: Synopsis The perovskite type mangan
Page 11 and 12: to the t 2g and e g spin-up states
Page 13 and 14: Bibliography [1] R. von Helmolt, J.
Page 15 and 16: Contents CERTIFICATE Acknowledgemen
Page 17 and 18: List of Figures 1.1 Temperature dep
Page 19 and 20: 2.2 Schematic view of the energetic
Page 21 and 22: 3.4 O K edge x-ray absorption spect
Page 23 and 24: Chapter 1 Introduction 1
Page 25 and 26: Introduction 3 The temperature and
Page 27 and 28: Introduction 5 Figure 1.2: Schemati
Page 29 and 30: Introduction 7 Figure 1.4: A schema
Page 31 and 32: Introduction 9 Figure 1.6: Schemati
Page 33 and 34: Introduction 11 Figure 1.8: Differe
Page 35 and 36: Introduction 13 Figure 1.10: A sche
Page 37 and 38: Introduction 15 Figure 1.12: Schema
Page 39 and 40: Introduction 17 Figure 1.13: Phase
Page 41 and 42: Bibliography [1] R. von Helmolt, J.
Page 43 and 44: Introduction 21 [31] Damien Saurel,
Page 45 and 46: Chapter 2 Experimental Techniques 2
Page 47 and 48: Experimental Techniques 25 Figure 2
Page 49 and 50: Experimental Techniques 27 Let us n
Page 51: Experimental Techniques 29 and G(k,
Page 55 and 56: Experimental Techniques 33 point wi
Page 57 and 58: Experimental Techniques 35 negative
Page 59 and 60: Experimental Techniques 37 ∆E = E
Page 63 and 64: Experimental Techniques 41 ( ) dσ
Page 65 and 66: Experimental Techniques 43 The expe
Page 67 and 68: Experimental Techniques 45 are weld
Page 77 and 78: Bibliography [1] H. Hertz, Ann. Phy
Page 79 and 80: Experimental Techniques 57 [35] K.
Page 81 and 82: Chapter 3 Electronic Structure of P
Page 83 and 84: Electronic Structure of Pr 0.67 Ca
Page 95 and 96: Bibliography [1] I. G. Deac, J. F.
Page 99 and 100: Chapter 4 Electronic Structure of P
Page 101 and 102: Electronic Structure of Pr 1−x Ca
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Electronic Structure of Pr 1−x Ca
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Electronic Structure of Ca 0.86 Pr
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Bibliography [1] C. Zener, Phys. Re
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Summary and Conclusions 109 In this
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