The introduction of the CP-FTMW technique by Pate and co-workers has revolutionized the rotational spectroscopy field providing rapid acquisition of broadband spectra [1]. The design of a newly constructed chirped-pulse Fourier transform microwave spectrometer CP-FTMW covering the range of 6-18 GHz will be presented. In particular, the chirped pulse (6-18 GHz, 4 μs) is generated by a fast- arbitrary waveform generator (AWG, Keysight M8195A 65 GSa/s). Free Induction Decays (FID) are detected and collected on a recent generation of a fast oscilloscope (Keysight DSOZ634A 160 GSa/s). The high speed of the oscilloscope allows to achieve a high spectral resolution (FWHM better than 40 kHz) by recording the FID during 80 μs. Up to three pulsed nozzles can be used simultaneously [2]. The CP-FTMW spectrometer is currently used to study volatile organic molecules of atmospheric interest. The results of this work will be discussed in detail.
Hervé Damart and Gauthier Dekyndt are gratefully acknowledged for their technical assistance.
The present work was funded by the ANR Labex CaPPA, by the Regional Council Hauts-de- France, by the European Funds for Regional Economic Development, and by the CPER CLIMIBIO and CPER P4S.

[1] G. G. Brown, B. C. Dian, K. O. Douglass, S. M. Geyer, S. T. Shipman, B. H. Pate, Rev. Sci. Instrum., 79, p. 053103 (2008).
[2] N. A. Seifert, A. L. Steber, J. L. Neill, C. Perez, D. P. Zaleski, B. H. Pate, A. Lesarri, Phys. Chem. Chem. Phys., 15, p. 11468 (2013).