Variation of Compton Profiles of N2 with Increasing Pressures

Yıl 2016, Cilt: 1 Sayı: 2, 2 - 8, 31.12.2016

Ali Gürol , Erdem Şakar , Osman Yücel

Öz

In
this study, it has been measured the Compton Profile of the Nitrogen gas at
different pressures by using a Compton Profile Spectrometer with an annular
Am-241 radioactive source, which emits 59.537 keV photons. The inelastic
scattered g-rays from gas molecules in a gas chamber have been measured
using a HPGe detector connected to the a Tennelec 244 Amplifier and MAESTRO MCA
Software.  The gas pressure had been set by
using a manometer before the measurements. The data have been corrected for all
environmental scattering effects, i.e. scattering from gas chamber’s walls,
collimators, and etc. Then, the Compton Profile of Nitrogen gases at five different
pressures have been determined using a Matlab Code. We found that the Compton
Profiles changes with increasing pressures.

Anahtar Kelimeler

Compton Profile, Pressure, Nitrogen gas, Electron Momentum Distribution

Artan Basınç ile N2’nin Compton Profilelerinin Değişimi

Öz

Bu çalışmada, 59.537 keV enerjili g-ışınları yayınlayan
bir Am-241 radyoaktif kaynağa sahip Compton Spektrometresi kullanılarak azot
gazının Compton Profilleri ölçüldü. Bir gaz odasına hapsedilmiş gaz
moleküllerinden inelastic olarak saçılmış g-ışınları Tennelec
244 Yükseltici ve MAESTRO MCA Programına bağlanmış bir HPGe dedektör
kullanılarak ölçüldü. Ölçümlerden önce gaz basıncı bir manometre ile ayarlandı.
Veriler, bütün çevresel saçılma etkileri için, gaz odasının duvarlarından,
kolimatörlerden, vs., saçılmalar gibi, düzeltildi.  Daha sonra, beş farklı basınçta azot gazının
Compton Profileleri Matlab’de yazılmış bir program ile belirlendi. Compton
Profile değerlerinin artan basınçla değiştiği belirlendi.

Anahtar Kelimeler

Compton Profile, Basınç, Azot gazı, Elektron Momentum Dağılımı

Kaynakça

• [1] Cooper M.J. (1985). Compton-Scattering and Electron Momentum Determination. Reports on Progress in Physics. 48. 415-481.
• [2] Williams B.G. (1977). Compton Scattering: The Investigation of Electron Momentum Distributions: McGraw-Hill International.
• [3] Yang F. and Hamilton J.H. (1996). Modern Atomic and Nuclear Physics: McGraw-Hill Book Co.
• [4] Biggs F.. Mendelsohn L.B. and Mann J.B. (1975). Hartree-Fock Compton profiles for the elements. Atomic Data and Nuclear Data Table. 16. 201-309.
• [5] Huotari S.. Soininen J.A.. Pylkkanen T.. Hamalainen K.. Issolah A.. Titov A.. McMinis J.. Kim J..Esler. K.. Ceperley D. M. Holzmann M. and Olevano V. (2010). Momentum Distribution and Renormalization Factor in Sodium and the Electron Gas. Physical Review Letters. 105. 086403.
• [6] Holzmann M.. Bernu B.. Pierleoni C.. McMinis J.. Ceperley D. M.. Olevano V. and Delle Site L. (2011). Momentum Distribution of the Homogeneous Electron Gas. Physical Review Letters. 107. 110402.
• [7] Olevano V.. Titov A.. Ladisa M.. Hamalainen K.. Huotari S. And Holzmann M. (2012). Momentum distribution and Compton profile by the ab initio GW approximation. Physical. Review B. 86. 195123.
• [8] Erba A.. Pisani C.. Casassa S.. Maschio L.. Schutz M. and Usvyat D. (2010). MP2 versus density-functional theory study of the Compton profiles of crystalline urea. Physical Review B. 81. 165108.
• [9] Pisani C.. Erba A.. Casassa S.. Itou M. and Sakurai Y. (2011). Anisotropy of the electron momentum distribution in alpha-quartz investigated by Compton scattering and ab initio simulations. Physical Review B. 84. 245102.
• [10] Pisani C.. Itou M.. Sakurai Y..Yamaki R.. Ito M.. Erba A. and Maschio L. (2011). Evidence of instantaneous electron correlation from Compton profiles of crystalline silicon. Physical Chemistry Chemical Physics. 13. 933-936.
• [11] Eisenberger P. and Platzman P. M. (1970). Compton Scattering of X-Rays from Bound Electrons. Physical Review A. 2. 415-.
• [12] Eisenberger P. and Reed W.A. (1972). Gamma-Ray Compton-Scattering - Experimental Compton Profiles for He. N2. Ar. and Kr. Physical Review A. 5. 2085.
• [13] Holm P. and Ribberfors R. (1989). 1st Correction to the Nonrelativistic Compton Cross-Section in the Impulse Approximation. Physical Review A. 40. 6251-6259.
• [14] Jaiswal P. and Shukla A. (2007). Kinetically balanced Gaussian basis-set approach to relativistic Compton profiles of atom. Physical Review A. 75. 022504.
• [15] Sakurai H.. Ota H.. Tsuji N.. Itou M. and Sakurai Y. (2011). Accurate Compton scattering measurements of noble gases: the importance of electron correlations in heavy atoms. Journal of Physics B-Atomic Molecular and Optical Physics. 44. 065001.
• [16] Eisenberger P. and Reed W.A. (1974). Relationship of Relativistic Compton Cross-Section to Electrons Velocity Distribution. Physical Review B. 9. 3237-3241.
• [17] Weyrich W. (1975). Electron Momentum Distribution in Solid Potassium Fluoride. Studied by Compton-Scattering. Berichte Der Bunsen-Gesellschaft-Physical Chemistry Chemical Physics 79. 1085-1095.
• [18] Eisenberger P. (1972). Compton-Profile Measurements of N2. O2. and Ne Using Silver and Molybdenum X-Rays. Physical Review A. 5. 628.
• [19] Paakkari T. and Merisalo M. (1975). Experimental Compton Profile of N2. Chemical Physics Letters. 33. 432-435.