The application of an innovative spectroscopic balancing technique to measure the isotope 18O/16O ratio in water vapor is reported. Quartz enhanced photoacoustic spectroscopy has been employed as the absorption sensing technique. Two isotope absorption lines with the same quantum numbers, with very close lower energy levels, have been selected to limit the sensitivity to temperature variations ...

The inductively coupled plasma is a promising excitation source for the simultaneous multielement determination of trace (nanogram per milliliter) elements in biological fluids. As little as 25 tl of sample fluid (whole blood, serum, or plasma) has been used, with essentially no sample preparation. This technique offers significant advantages over other methods requiring considerable sample han...

We describe a new experimental technique for studying the propagation of light in scattering media. We use terahertz time-domain spectroscopy to generate and detect sub-picosecond pulses of far infrared radiation, and employ these pulses in spectroscopic studies of synthetic random media. This technique offers a number of unique advantages in comparison with other experimental methods, includin...

in the surgical treatment of malignant tumors, it is crucial to characterize the tumor as precisely as possible. the determination of the exact tumor location as well as the analysis of its properties is very important in order to obtain an accurate diagnosis as early as possible. in neurosurgical applications, the optical, non-invasive and in situ techniques allow for the label-free analysis o...

Single Crystals of L-lysine sulphate (abbreviated as LLS), a semiorganic nonlinear (NLO) materials have been successfully grown by slow solvent evaporation solution growth technique at room temperature. Solubility curve of LLS has been determined in mixed solvent of acetone and water. The grown crystal is characterized by single crystal X-ray diffraction (XRD) and Fourier transform infrared spe...

The hyphenated technique is developed from the coupling of a separation technique and an on-line spectroscopic detection technology. The remarkable improvements in hyphenated analytical methods over the last two decades have significantly broadened their applications in the analysis of biomaterials, especially natural products. In this article, recent advances in the applications of various hyp...

This paper deals with an absorption spectroscopic method for trace gas measurements called DOAS (Diierential Optical Absorption Spectroscopy) from a statistical point of view. The DOAS technique is an absorption spectrosco-pic technique to measure trace gas concentrations. It is capable of detecting and measuring a number of important trace gases at tropospheric concentration levels by observin...

this review describes the Auger Electron Spectroscopy (AES), Low Energy Electron Diffraction (LEED), Raman Spectroscopy & Field Ion Microscopy (FIM) techniques for materials characterization at the atomic and molecular level along with composition, and vibration frequencies of a substance. The goal is to provide an overview of the utilization of these instrumental methods for analyzing the surf...

In this review, we demonstrate a real-time time-frequency two-dimensional (2D) pump-probe imaging spectroscopy implemented on a single shot basis applicable to excited-state dynamics in solid-state organic and biological materials. Using this technique, we could successfully map ultrafast time-frequency 2D transient absorption signals of β-carotene in solid films with wide temporal and spectral...

Definitive data on the absorption spectrum of pure water from 380 to 700 nm have been obtained with an integrating cavity technique. The results are in good agreement with those recently obtained by our group with a completely independent photothermal technique. As before, we find that the absorption in the blue is significantly lower than had previously been generally believed and that the abs...