Transient absorption and emission and the measurement of T1 and T2 in the J O→1 rotational transition in OCS

Abstract

Stark switching microwave experiments on transient absorption and transient emission that allow the measurement of T1 and T2 in the J = 0→1 transition in OCS are described. The results from the transient absorption experiments are T1 = (26±4) × 10−6 sec · mtorr and T2 = (33±7) × 10−6 sec · mtorr. The results of the transient emission experiments give T2 = (31±3) × 10−6 sec · mtorr. Thus, T1 = T2 within the experimental uncertainties. We also demonstrate the effects of π/2 and π pulses by using Stark switching.

The measurement of T1 and T2 for the ammonia inversion doublets in the ground vibrational state

“…The decay of the population difference in all M states is probed by 1T/2 polarization with the Stark field off. The value of T 1 obtained for the (3,3) transition by this technique agreed with the result in Table I, which indicates that T 1 is equivalent for all M states within each (J, K) level. This conclusion is similar to the conclusion drawn earlier concerning the equivalence of polarization relaxation, T 2, for the M states.…”

“…5 A second check on the results in Table I involved the recording and analysis of the on-resonance transient absorption 2 for both the J = M states (Stark field on) and all M states (Stark field off) in the inversion doublets. Although this method is a less accurate technique of measuring Tl and T 2 , the results for the (J, K)= (3,3) transition served to collaborate the corresponding T2/T ratio in Table 1. 1 . F!nally, we also note that our result for the T2/Tl ra-tIo In the (2, 1) transition in 15 NH3 is in close agreement with the recent result given by Somers et al 7 These measurements utilized a pulse sequence method similar to that used here.…”

Chiral rotational spectroscopy

“…Our model should be well suited to values such as [39,111,112,115,116,[118][119][120][121][122][123][130][131][132] y 0 ∈ [l − d 2, d 2], I 0 = 1.00 × 10 11 kg.s −3 , γ = 5.64 × 10 −4 m, 2π k = 5.320000 × 10 −7 m, σ = 1.000, l = 3.000000 × 10 −1 m, β = 1.000 × 10 −1 , χ = 4.0 × 10 −3 , δ = 1 × 10 −4 , R = 4.000 × 10 −1 m, with r⟩ and ̵ hω r denoting the particular forms taken at r = r 0 in the absence of the light. We assume that the ∆ r(r)⟩ constitute but small corrections to the r⟩ of interest, as, by construction throughout the active region, the static magnetic field is highly uniform and directed essentially parallel to the direction of propagation of the light, so that essentially the same quantisation axis for the rotational degrees of freedom of the molecules is favoured by both.…”

Chirped-Pulse Millimeter-Wave Spectroscopy of Rydberg-Rydberg Transitions

“…A low power CP can completely polarize the transitions and create an FID that is of comparable strength to the CP. Interference between the FID and the CP (transient nutation [11,[22][23][24]) is demonstrated in Fig. 3a.…”

“…3b, to be 3.3×10 −6 esu = 0.099 V/m. Given that [11,24], where λ = 3.9 mm is the mm wave wavelength and L ≈ 10 cm is the extent of the sample in the mm wave propagation direction (Fig. 1), we obtain n ≈ 1×10 6 cm −3 total 36s and 36p population.…”