دراسة عملية ونظرية لمستويات الطاقة الالكترونية والتذبذبية لبعض الاوساط الفعالة لليزرات الصبغة == The study of practical and theoretical levels Electronic and vibrational energy to some active media for dye lasers
Author name:
منى لطيف حمد
Supervisor name:
لازم حسن عبود | جبار حسين ابراهيم
General topic:
Physics
Specific topic:
Laser Physics and Electro-optics
Degree:
Master
University:
University of Babylon - College Of Science For Girls - Physics Department
Language:
Arabic
University location:
Babylon
First pages:
26T1628 - p.pdf
Abstract:
This research included the practical and theoretical study, as follows : - The study of the energy levels of molecular vibrational experimentally and theoretically, and in the study process measured vibration modes for solution two dye (Pop - Pop + Chloroform) and (Acridine Orang + ethanol) and the calculation of the intensity of absorption and the wave number of the infrared spectrum Central (MID - IR.) using infrared spectrometer F.T. I.R.As for Theoretically was calculated and the diagnosis of the fundamental vibrational modes of Acridine Orang dye, and calculate their intensity as well as wave numbers using a program (Gaussian 09) from these modes C - H str. , C - H ben. , C - O ben. , C = Cstr. , C= N str …….From above results noticed that there's a mismatch between practical and theoretical results of vibrational modes with a relative difference between the intensities measured practically and theoretically.In the second part it has been studied the electronical energy levels of molecules experimentally and theoretically. The study was conducted using different solvents know the effect of the solvent type and the different concentrations (0.5×10 - 3 , 1×10 - 3, 0.5 ×10 - 4, 1×10 - 4 , 1×10 - 5)Ml to pop - pop dye with Chloroform and toluene solvent, and Acridine Orang dye with ethanol solvent . On the other the absorption , fluorescence spectra , linear optical properties (absorption coefficient, refractive index, life time , Life time and quantum yield of florescence level ).Ranged wavelengths of the absorption spectra for pop - pop solutions between (352 - 337) nm in Chloroform and (343 - 337) nm for first peak and(358 - 355) nm for toluene the second peak. In the Acridine Orang solutions, wavelengths ranged between (490 - 478) nm in ethanol.All these wavelengths with in the transitions in molecular electrical orbits at type (n*).the results were shifted absorption spectrum and emission (fluorescence) spectra peaks to ward shorter wavelengths (blue shift), increase the value of liner absorption coefficients and liner refractive index when increasing at the concentration of the solution.from the results shows that the life time of fluorescence increases quantum yield decreases with increasing concentration of the solution.By using a program (Gaussian view 0. 5) has been drawing the molecular electrical orbits theoretically of Acridine Orang dye, and diagnosed (n , , *, , *) orbits, which recorded a match which was a transitions in at type (n*).Theoretically, using a program (Gaussian 09) were studied energy of the levels (HOMO , LUMO), the energy (8.451 eV) and (0.1306 eV) respectively, as well as energy gap (Eg 8.451 eV) has been calculated
