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. 2015 Oct 21;15(10):26743–26755. doi: 10.3390/s151026743

Figure 2.

Figure 2

(a): 2f QEPAS signal when the laser temperature is scanned with 1250 mW laser power at atmospheric pressure and room temperature. The spectrum plotted by a black line is from 47 ppm H2S:47 ppm NH3:N2; the spectrum plotted by a red dash line is from 50 ppm H2S:N2; (b): Line strengths of the H2S and NH3 transitions, as reported in the HITRAN database, within the frequency span of Figure 2a.