Gönül Başar

FT-IR AND LASER RAMAN SPECTROSCOPIC INVESTIGATION OF TRANSITION METAL HALIDE COMPLEXES OF BENZIDINE

Abstract FT-IR and Raman spectra of MX 2 Bzn {where M=Mn or Co, X=Cl; M=Cd, X=Cl or I; and Bzn=benzidine; C 12 H 8 (NH 2 ) 2 } complexes have been investigated in the region between 200–4000 cm −1 and all the bands observed are assigned. Spectroscopic investigation indicates that benzidine molecules are bound to metal through both nitrogen lone pairs and bidentate ligands. It is found that benzidine molecules are centrosymmetric in the complexes. Coordination effects on internal modes of benzidine, particularly on the NH 2 group vibrations are discussed. The general influence of the metal on the state of the coordinated amino-group is found to be similar to the characteristics of the aniline complexes.

Experimental hyperfine structure investigation of atomic La

Optogalvanic laser spectroscopy has been applied to measure the hyperfine structure of 19 spectral lines of La I in the wavelength regions from 570 to 590 nm and 700 to 825 nm. Experimental hyperfine structure constants A and B of the isotope139La have been measured for 16 levels of odd parity. From those values six magnetic dipole and ten electric quadrupole constants have been determined for the first time. Some disagreements with previously obtained values are discussed.

High-resolution laser spectroscopy of the hyperfine structure of high-lying levels of Nb i

High-resolution laser spectroscopy techniques have been applied in the wavelength range between 645 and 675 nm to measure the hyperfine structure (hfs) of high-lying levels of atomic niobium. Using Doppler-limited optogalvanic spectroscopy 20 well-resolved spectra were measured and 10 spectra using Doppler-reduced saturation absorption spectroscopy technique. We have precisely determined the magnetic dipole hfs constants A of 42 levels and electric quadrupole hfs constants B of 15 levels. For the first time 17 A constants and 5 B constants were measured.

Hyperfine structure investigation of 187Os atomic levels via optical–optical double resonance

Optical–optical double resonance spectroscopy has been applied to measure the hyperfine structure of spectral line pairs of atomic osmium in the visible wavelength range. In the experiments, enriched isotope samples of either 189Os or 187Os were used. In this way, the magnetic dipole hyperfine interaction constants of the odd isotope 187Os were determined for seven levels of even parity and two levels of odd parity.

Sorting of micron-sized particles using holographic optical Raman tweezers in aqueous medium

ABSTRACT We have constructed a holographic optical tweezers system combined with Raman spectroscopy to sort trapped particles. Our software automatically moves the trapped objects to the measurement positions to obtain individual Raman signals from multiple trapped particles. We performed the sorting by comparing their spectra with the previously measured training dataset using the correlation coefficients. We used yeast cells and polystyrene beads as test particles. This study aims to show that biological particles can be separated using single cell analysis with combined holographic optical tweezers and Raman spectroscopy system.