Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

International Journal of Molecular Sciences

Luigi Santamaria¹  Paolo De Natale²  Iolanda Ricciardi³  Valentina Di Sarno³  Pasquale Maddaloni³  Roberto Aiello³  Maurizio De Rosa³ 

[1] Agenzia Spaziale Italiana, Contrada Terlecchia, 75100 Matera, Italy;Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy;Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, Italy;

关键词: acetylene;    buffer-gas-cooling;    infrared frequency combs;    precision spectroscopy;   

DOI  :  10.3390/ijms22010250

来源: DOAJ

【 摘 要 】

We review the recent developments in precision ro-vibrational spectroscopy of buffer-gas-cooled neutral molecules, obtained using infrared frequency combs either as direct probe sources or as ultra-accurate optical rulers. In particular, we show how coherent broadband spectroscopy of complex molecules especially benefits from drastic simplification of the spectra brought about by cooling of internal temperatures. Moreover, cooling the translational motion allows longer light-molecule interaction times and hence reduced transit-time broadening effects, crucial for high-precision spectroscopy on simple molecules. In this respect, we report on the progress of absolute frequency metrology experiments with buffer-gas-cooled molecules, focusing on the advanced technologies that led to record measurements with acetylene. Finally, we briefly discuss the prospects for further improving the ultimate accuracy of the spectroscopic frequency measurement.

【 授权许可】

Unknown