Abstract

We have measured the pressure-induced shift for 15 lines of the ν1+ν3 rotational–vibrational band of acetylene  12C2H2. These lines are useful as wavelength references in the 1510–1540-nm region. We find that the pressure shift varies from +0.008(2) pm/kPa for line R1 to +0.043(2) pm/kPa for line R27, with many of the lines exhibiting a shift near +0.017 pm/kPa (or, equivalently, +2.3×10-3 pm/Torr or -0.29 MHz/Torr). In addition, we have measured the pressure broadening of these lines and find that it also varies with line number and is typically ∼0.7 pm/kPa (∼12 MHz/Torr). We also evaluate the line sensitivity to temperature changes and electromagnetic fields.

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