Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Isotope Ratio Dual-Comb Spectrometer   We demonstrate the use of dual-comb spectroscopy for isotope ratio
measurements. We show that the analysis spectral range of a free-running
near-infrared dual-comb spectrometer can be extended to the mid-infrared by
difference frequency generation to target specific spectral regions suitable
for such measurements, and especially the relative isotopic ratio $\delta
{}^{13}$C. The measurements performed present a very good repeatability over
several days with a standard deviation below 2$\unicode{x2030}$ for a recording
time of a few tens of seconds, and the results are compatible with measurements
obtained using an isotope ratio mass spectrometer. Our setup also shows the
possibility to target several chemical species without any major modification,
which can be used to measure other isotopic ratios. Further improvements could
decrease the uncertainties of the measurements, and the spectrometer could thus
compete with isotope ratio spectrometers currently available on the market.

37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math