Research Laboratories Information System
Laser Spektroskopi Laboratuvarı
Laser Spektroskopisi
Laboratuvarı'nda elementlerin atomik spektrumlarından yararlanarak aşırı ince yapı sabitlerinin
belirlenmesi, atomların bilinmeyen spektral çizgilerinin ve bilinmeyen enerji seviyelerinin tespiti yapılmaktadır. Aşırı ince yapı sabitleri astrofizikte de kullanılmaktadır. Bu
bakımdan disiplinler arası çalışmaya uygun bir alandır.
2012'de kurulan Laser Spektroskopi Laboratuvarı Doppler indirgenmiş laser spektroskopik incelemelere dayanır; atom ve iyonlarda Laserle uyarılmış floresans spektroskopisi (LIF), Laser optogalvanik spektroskopi (LOGS) ve Doymuş soğurma spektroskopisi (SAS).
İstanbul Üniversitesi, Fen Fakültesi, Fizik Bölümü, Atom ve Molekül Fiziği ABD. 34134 Vezneciler-Fatih/İstanbul
Toplam kullanılan BAP Kaynağı: 707.180,00 TL
Determination of the hyperfine structure constants by utilizing the atomic specta of elements, identification of the unknown energy levels and spectral lines of atoms are carried out in Laser Spectroscopy Laboratory. The hyperfine structure constants are also used in astrophysics. In this regard, it is an appropriate area of interdisciplinary studies.
Laser Spectroscopy Laboratory, founded in 2012, is based on Doppler reduced or Doppler limited laser spectroscopic investigations; Laser induced fluorescence spectroscopy (LIF), Laser optogalvanic spectroscopy (LOGS) and Saturation absorption spectroscopy (SAS) on atoms and ions.
Spectroscopic methods are applied to search for new energy levels and hyperfine structure of Atoms, using a continuous wave tuneable titan-sapphire laser (Coherent MBR-110 pumped by Coherent Verdi 18 W) in the wavelength range from 700 nm to 1100 nm. The laser run with a power of about 4 W and a scan width up to 30 GHz. The absolute wave number of the laser is measured using a wavemeter (High Finesse WS-6) with an accuracy of 0.007 cm-1 or 200 MHz.
Our international cooperations
are Hochschule für Technik und Wirtschaft Berlin The University of Latvia,
Laser Centre, Riga, Technische Universität Graz, Institüt für
Experimentalphysik, Laboratory of Quantum Engineering and Metrology, Poznan
University of Technology. Our research subjects are multidisciplinary. New laboratory studies of
hyperfine structure constants of atoms are also needed for astrophysics.
Istanbul University Faculty of Science, Department of Physics, Atomic and Molecular Physics Div., 34134 Vezneciler- Fatih/Istanbul
Total resource (BAP): 707.180,00 TL
Cihaz Adı : Monokromatör
Marka : McPherson
Model : 207
Teknik Özellik : 0.67m odaklama uzunluğu, 120x140 mm 220 mm genişliğe Echelle kırınımm ağına sahip
Miktar : 1
Cihaz Kaynağı : BAPCihaz Adı : Dalgaboyu Ölçer
Marka : HighFinesse/Angstrom
Model : WS6-200/845
Teknik Özellik : Ölçüm aralığı 350-1100 nm ve hassasiyeti 200 MHzdir.
Miktar : 1
Cihaz Kaynağı : BAPCihaz Adı : Katıhal Laser
Marka : Coherent
Model : Verdi 18 SF
Teknik Özellik : Nd:YVO4 laser, 532 nm single modda 18W çıkış gücüne sahip.
Miktar : 1
Cihaz Kaynağı : BAPCihaz Adı : Titan Safir Laser
Marka : Coherent
Model : MBR110
Teknik Özellik : Taranabilir, sürekli ışık veren 4W çıkış gücüne sahip.
Miktar : 1
Cihaz Kaynağı : BAP
- Makale & Yayın (3)
- Sanayi İşbirliği (0)
- Patent (0)
- Dış Kaynaklı Çalışma (0)
- Faydalı Model (0)
- Ticarileşme (0)
- Proje (2)
- Adı : New energy levels of atomic niobium by laser induced fluorescence spectroscopy in the near infrared wavelength range
Açıklama : -
Ekip : I. K. Oztürk, Gö. Başar, A. Er, F. Güzelçimen, S. Kröger - Adı : Parametric study of the fine and hyperfine structure for the even parity
configurations of atomic Niobium
Ekip : J. Dembczynski, M. Elantkowska, Ruczkowski, I. K. Oztürk, Gö. Başar, F. Güzelçimen, A. Er, S. Kröger - Adı : Hyperfine Structure Investigations Of Atomic Niobium With Optogalvanic And Laser-Induced Fluorescence Spectroscopy In The Near-Infrared Wavelength Range
Açıklama : Aims: The aim of this work is to increase the amount of hyperfine structure data of atomic niobium (Nb I), which is needed for astrophysicists for the detailed analysis of new stellar spectra. Particular emphasis was placed on the investigation of energy levels with unknown hyperfine structure constants. Methods: The hyperfine structure in the spectrum of Nb I was studied using laser-induced fluorescence spectroscopy and laser optogalvanic spectroscopy with a tuneable single-mode cw Ti:Sa laser in the wavelength range from 750 nm to 865 nm. The Nb atoms were produced and excited in a liquid-nitrogen-cooled hollow-cathode plasma. Results: We measured and analysed 81 spectral lines, 19 of which are not previously known from the literature. In total, the magnetic dipole hyperfine structure constants A were determined for 28 energy levels of even and 53 energy levels of odd parity. The electric quadrupole hyperfine structure constants B were only determined in a few cases, when the spectra were clearly resolved and/or when a level was found from several transitions. The magnetic dipole hyperfine structure constants A of 13 even and 11 odd levels as well as the electric quadrupole hyperfine structure constants B of 13 even and 17 odd levels are presented for the first time. For the other levels, improved values of hyperfine structure constants are given. Conclusions: The hyperfine structure can have a significant effect on stellar absorption line profiles, and the corresponding abundances can be substantially overestimated if these effects are not taken into account. Therefore, a detailed consideration of the hyperfine structure is important for stellar abundance determinations. The present work substantially increases the knowledge of hyperfine structure of Nb, which plays an important role in investigating the nucleosynthesis of heavy elements.
Ekip : Başar G., Başar G., Öztürk İ., Er A., Güzelçimen F., Kröger S.
| Adı | Açıklama | Ekip |
|---|---|---|
| No records found. | ||
| Adı | Açıklama | Ekip |
|---|---|---|
| No records found. | ||
| Adı | Açıklama | Ekip |
|---|---|---|
| No records found. | ||
| Adı | Açıklama | Ekip |
|---|---|---|
| No records found. | ||
| Adı | Açıklama | Ekip |
|---|---|---|
| No records found. | ||
| Tip | Adı | Açıklama | Ekip |
|---|---|---|---|
| Proje (BAP) | Kobalt (Co) Elementinin Aşırı İnce Yapısının Laserle Uyarılmış Floresans Spektroskopi Metodu ile İncelenmesi | Normal Kapsamlı Araştırma Projesi | Yürütücü: Doç.Dr. İpek K. Öztürk Yardımcı Araştırmacılar: Prof.Dr. Gönül Başar Yrd. Doç.Dr. Alev Er Yrd. Doç.Dr. Feyza Güzelçimen |
| Proje (BAP) | Laser Spektroskopik Metodlarla Atomların Aşırı İnce Yapılarının İncelenmesi | Normal Kapsamlı Araştırma Projesi | Yürütücü: Prof.Dr. Gönül Başar Yardımcı Araştırmacılar: Doç.Dr. İpek K. Öztürk Yrd. Doç.Dr. Alev Er Yrd. Doç.Dr. Feyza Güzelçimen |
© 2019 İstanbul Üniversitesi
Bilgi İşlem Daire Başkanlığı