The frequency shift of spectral lines from astronomical objects is most often explained by the Doppler Effect arising in relative motion and the broadening of a particular line is supposed to depend on the absolute temperature , pressure or the different line of sight velocities.. The Wolf effect on the other hand deals with correlation induced spectral changes and explains both the broadening ...

Experimental and theoretical Stark broadening studies of the Paschen beta line of hydrogen (lambda=1.28 microm) are reported. Line shape measurements were performed at electron densities of the plasma between 3.5 x 10(15) cm(-3) and 7.5 x 10(15) cm(-3), applying as the light source a wall-stabilized arc operated at atmospheric pressure in a helium-hydrogen gas mixture. The radiation of the plas...

Introduction: Impact vaporization process may have played an important role in the formation and evolution of the atmospheres and oceans of planets e.g.[1,2] and have had significant consequences to planets’ surface environment e.g.[3,4]. Although a mechanical aspect of this process has been investigated extensively, its chemical aspect has not been studied to a great depth. One of the reasons ...

Absorption coefficients of the 1397 cm-l, V3, band of peroxynitric acid (H02N02) have been measured at 225-230 K in order to calculate the feasibility of detecting this spectral feature in atmospheric spectra. High-resolution (0.0078 cm-l) Fourier transform spectra (13701430 cm-l) of low pressure gas-mixtures containing H02N02 were analyzed to determine the absorption coefficient, k(v). The max...

A model is proposed for chromophore optical spectra in solids over a wide range of temperatures and pressures. Inhomogeneous band shapes and their pressure dependence, as well as baric shift coefficients of spectral lines, selected by the frequency, were derived using Lennard-Jones potentials of the ground and excited states. Quadratic electron-phonon coupling constants, describing the thermal ...

für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namen...

Spectral lines in the optical spectra of atoms, molecules, and other quantum systems are characterized by a range frequencies ω or wavelengths λ=2πc/ω, where c is speed light. Such frequency wavelength called width spectral (linewidth). It influenced many specific factors. Thermal motion molecules results broadening as result Doppler effect (thermal broadening) their collisions (pressure broade...