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Measurement of Longitudinal Relaxation Rate Constant of Rotational Transition of H2O by the Microwave Frequency-Switching Method

The longitudinal relaxation rate constant T1-1 is measured for the first time for the 616←523 rotational transition of H2O by simultaneous application of the rotary echo and the free induction decay methods based on the frequency-switching technique. The T2-1 rate constant is remeasured and the previously-reported value is revised. The constants obtained in the present experiment under the field-free condition are (1/2πT1p)=22.3±3.0 [MHz/Torr] and [1/2πT2p]=15.1±0.7 [MHz/Torr], and the ratio T2/T1=1.47±0.20. Examination of the transient responses of the resolved Stark components in the presence of a d.c. electric field suggests that T2-1 does not depend on the M-quantum number.