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Feb 7, 2016 - plays a larger role in the formation of spectral lines ?0 for air broadening, i.e. for molecules like sub- merged in a N2 atmosphere, and for self-broadening,. ISBN 978-3-03897-456-7 (PDF). Cover image Measurement of Electron Density from Stark-Broadened Spectral Lines Appearing in Silver After combining the contributions from weak and strong collisions, the authors obtained the. Broadening of spectral lines. An individual atom/molecule making a transition between energy levels emits one photon with a well-defined energy / frequency. Line Broadening First, Ask class: why can't a spectral line be arbitrarily sharp? different directions with different speeds, will produce a line blend with The broadening of spectral lines which is caused by the interaction between impurity-center electrons the contributions to the broadening combine addi- tively. Real spectral lines are broadened because: – Energy Determines the natural width of a line Combine Doppler shift with the one-dimensional distribution.Thermal Doppler broadening Since the spectral line is a combination of all of the emitted radiation, the higher the temperature of the gas, the broader the spectral line emitted from that gas. This broadening effect is described by a Gaussian profile and there is no associated shift. Real spectral lines are broadened because: – Energy Determines the natural width of a line Combine Doppler shift with the one-dimensional distribution.Thermal Doppler broadening Since the spectral line is a combination of all of the emitted radiation, the higher the temperature of the gas, the broader the spectral line emitted from that gas. This broadening effect is described by a Gaussian profile and there is no associated shift. Feb 14, 2012 -