Table 1 Quantification of CH3CN concentration for 5 gas samples at different concentrations using static THz spectroscopy.

From: Dynamic terahertz spectroscopy of gas molecules mixed with unwanted aerosol under atmospheric pressure using fibre-based asynchronous-optical-sampling terahertz time-domain spectroscopy

Gas sample

Acetonitrile concentration by volume (%)

Estimated detection limit (ppm)

Linewidth ∆ν (cm−1)

Linewidth ∆ν uncertainty (cm−1)

RMS

#1

0.341

20

0.152

0.0022

0.0016

#2

0.497

20

0.150

0.0015

0.0015

#3

0.580

40

0.147

0.0017

0.0023

#4

0.800

40

0.157

0.0016

0.0025

#5

1.356

40

0.167

0.0011

0.0029

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