Abstract
Pressure-induced lineshifts are measured by a new technique involving an infrared diode laser which is frequency-stabilized on the absorption peak of the studied line. Corresponding laser frequency shifts are discriminated by means of a reference cell filled with the same gas. The performance has been demonstrated on the ν2 and (2ν2 − ν2) lines of NH3. Pressure-induced lineshifts smaller than 10 kHz/Torr (i.e., 0.25 × 10−3 cm−1/atm) are determined using a 10-Torr pressure range only. The sensitivity and reliability of this technique are critically discussed.
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