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A theoretical model of the influence of detection bandwidth properties onobserved line shapes in laser absorption spectroscopy is described. The modelpredicts artificial frequency shifts, extra broadenings and line asymmetrieswhich must be taken into account in order to obtain accurate centralfrequencies and other spectroscopic parameters. This reveals sources ofsystematic effects most probably underestimated so far potentially affectingspectroscopic measurements. This may impact many fields of research, fromatmospheric and interstellar physics to precision spectroscopic measurementsdevoted to metrological applications, tests of quantum electrodynamics or otherfundamental laws of nature. Our theoretical model is validated by linearabsorption experiments performed on H2O and NH3 molecular lines recorded byprecision laser spectroscopy in two distinct spectral regions, near- andmid-infrared. Possible means of recovering original line shape parameters orexperimental conditions under which the detection bandwidth has a negligibleimpact, given a targeted accuracy, are proposed. Particular emphasis is put onthe detection bandwidth adjustments required to use such high-quality molecularspectra for a spectroscopic determination of the Boltzmann constant at the 1ppm level of accuracy.

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Absorption line shape recovery beyond the detection bandwidth limit:  application to the precision spectroscopic measurement of the Boltzmann  constant