Physics – Atomic Physics
Scientific paper
2007-11-02
Phys. Rev. Lett. 100, 083003 (2008)
Physics
Atomic Physics
10 pages + 3 figures (11 pages total) v2 has minor corrections and explanations accepted for publication in PRL
Scientific paper
10.1103/PhysRevLett.100.083003
The v = 1 -> 0 radiative lifetime of NH (X triplet-Sigma-, v=1,N=0) is determined to be tau_rad,exp. = 37.0 +/- 0.5 stat +2.0 / -0.8 sys miliseconds, corresponding to a transition dipole moment of |mu_10| = 0.0540 + 0.0009 / -0.0018 Debye. To achieve the long observation times necessary for direct time-domain measurement, vibrationally excited NH (X triplet-Sigma-, v=1,N=0) radicals are magnetically trapped using helium buffer-gas loading. Simultaneous trapping and lifetime measurement of both the NH(v=1, N=0) and NH(v=0,N=0) populations allows for accurate extraction of tau_rad,exp. Background helium atoms are present during our measurement of tau_rad,exp., and the rate constant for helium atom induced collisional quenching of NH(v=1,N=0) was determined to be k_q < 3.9 * 10^-15 cm^3/s. This bound on k_q yields the quoted systematic uncertainty on tau_rad,exp. Using an ab initio dipole moment function and an RKR potential, we also determine a theoretical value of 36.99 ms for this lifetime, in agreement with our experimental value. Our results provide an independent determination of tau_rad,10, test molecular theory, and furthermore demonstrate the efficacy of buffer-gas loading and trapping in determining metastable radiative and collisional lifetimes.
Campbell Wesley C.
Doyle John M.
Groenenboom Gerrit C.
Lu Hsin-I
Tsikata Edem
No associations
LandOfFree
Time-Domain Measurement of Spontaneous Vibrational Decay of Magnetically Trapped NH does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Time-Domain Measurement of Spontaneous Vibrational Decay of Magnetically Trapped NH, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Time-Domain Measurement of Spontaneous Vibrational Decay of Magnetically Trapped NH will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-438190