Surin L A, Dumesh B S, Rusin F S, Winnewisser G, Pak I
I. Physikalisches Institut, Universität zu Köln, Germany.
Phys Rev Lett. 2001 Mar 5;86(10):2002-5. doi: 10.1103/PhysRevLett.86.2002.
Doppler-free two-photon rotational transitions J = 13<--<--11 and J = 12<--<--10 of OCS and J = 8<--<--6 and J = 7<--<--5 of CHF (3) were detected in the frequency range 134-156 GHz, using a novel, highly sensitive intracavity-jet technique. The sub-Doppler narrowing of the observed peaks (down to 40 kHz full width at half maximum as compared to 300 kHz of the Doppler width) demonstrates the potential of this new technique for high precision millimeter wave spectroscopy. The possibilities of the further reduction of the two-photon absorption line widths are considered.
利用一种新型的高灵敏度腔内射流技术，在134 - 156吉赫兹频率范围内检测到了OCS的无多普勒双光子转动跃迁J = 13←←11和J = 12←←10，以及CHF₃的J = 8←←6和J = 7←←5。观测到的峰的亚多普勒窄化（半高全宽降至40千赫兹，而多普勒宽度为300千赫兹）证明了这种新技术在高精度毫米波光谱学中的潜力。还考虑了进一步减小双光子吸收线宽的可能性。
