Abstract Raman spectroscopy can be used to determine density of gases, because the energy fundamental vibrational modes is affected by intermolecular distances. The key problem estimation exact peak positions bands, analyses require a precision that mostly less than pixel resolution modern spectrometers. A new method bands and atomic emission lines in discontinuous spectrum without numerical ma...

QSOs' emission lines arise from highest velocity (∼ 10 4 km s −1), dense gas within ∼ 0.1 parsec of the central engine, out to low-velocity, low-density gas at great distances from the host galaxy. In radio-loud QSOs there are clear indications that the distribution and kinematics of emission-line gas are related to the symmetry axis of the central engine, as defined by the radio jet. These jet...

Studying the intrinsic properties of molecules in the gas-phase is advantageous, since it reduces the complexity present in solution that arises from interactions between the molecule of interest and other species present in the local environment, including those with the solvent itself. In this report, the photophysical properties of gaseous cationic rhodamine B (RBH + ) were determined and ph...

We report on improvements made on our previously introduced technique of cavity-enhanced Raman spectroscopy (CERS) with optical feedback cw-diode lasers in the gas phase, including a new mode-matching procedure which keeps the laser in resonance with the optical cavity without inducing long-term frequency shifts of the laser, and using a new CCD camera with improved noise performance. With 10 m...

There is an increasing need in many chemical sensing applications ranging from environmental science to industrial process control as well as medical diagnostics for fast, sensitive, and selective trace gas detection based on laser spectroscopy. The recent availability of continuous wave (cw) near infrared diode lasers-, mid-infrared quantum cascade and interband cascade distributed feedback (Q...

The interstellar presence of protonated nitrous oxide has been suspected for some time. Using established high-accuracy quantum chemical techniques, spectroscopic constants and fundamental vibrational frequencies are provided for the lower energy O-protonated isomer of this cation and its deuterated isotopologue. The vibrationally-averaged B0 and C0 rotational constants are within 6 MHz of thei...

We present complex refractive index measurements of Pd and Pt films from 700-1700nm using variable angle spectroscopic ellipsometry. Refractive index changes upon H2 gas adsorption were determined by measuring normal incidence reflection and transmission. Keywords-ellipsometry, refractive index, extinction coefficient, thin film, palladium, platinum, hydrogen, gas sensors

We present results from an extensive spectroscopic survey in the 3-5μm wavelength region of low-mass young stellar objects using VLT-ISAAC. Medium resolution spectra (λ/∆λ ∼ 1 000 − 10 000) of young embedded stars in the mid-infrared allow for detailed studies of ro-vibrational lines from molecular gas, interstellar ices and Polycyclic Aromatic Hydrocarbons (PAHs). By taking advantage of this w...