Absolute measurement of the S(0) and S(1) lines in the electric quadrupole fundamental band of D2 around 3 μm

Abstract

The electric quadrupole fundamental (v=1←0) band of molecular deuterium around 3 μm is accessed by cavity ring-down spectroscopy using a difference-frequency-generation source linked to the Cs-clock primary standard via an optical frequency comb synthesizer. An absolute determination of the line position and strength is reported for the first two transitions (J=2←0 and J=3←1) of the S branch. An accuracy of 6×10(-8) is achieved for the line-center frequencies, which improves by a factor 20 previous experimental results [A. R. W. McKellar and T. Oka, Can. J. Phys. 56, 1315 (1978)]. The line strength values, measured with 1% accuracy, are used to retrieve the quadrupole moment matrix elements which are found in good agreement with previous theoretical calculations [A. Birnbaum and J. D. Poll, J. Atmos. Sci. 26, 943 (1969); J. L. Hunt, J. D. Poll, and L. Wolniewicz, Can. J. Phys. 62, 1719 (1984)].

Bounds on fifth forces from precision measurements on molecules

“…The results from Hu et al [42], Campargue et al [41] and Kassi et al [43] are in agreement with theory, and result in a combined precision of the comparison of δE ∼ 1 × 10 −3 cm −1 . Maddaloni et al [40] claim an absolute accuracy for the S(0) and S(2) transitions of the fundamental ground tone in D 2 at 2 × 10 −4 cm −1 , however, a comparison to the theoretical value yields a 7σ discrepancy. Owing to this large inconsistency from Ref.…”

“…v = 0 to v = 2, 3) of H 2 and D 2 . The results from recent CRDS studies on the overtone quadrupole transitions of H 2 [41,42] and D 2 [40,43] can be used to extract constraints. The overtone transitions of H 2 and D 2 have intrinsically higher sensitivity of the transitions in comparison to the fundamental ground tone as shown in Fig.…”

“…Owing to this large inconsistency from Ref. [40], bounds derived from these transitions are not included.…”

“…In recent years, full-fledged level structure calculations, including QED and high-order relativistic contributions have also been carried out for the neutral hydrogen molecules and the deuterated isotopomers [32][33][34]. These calculations have been tested in the determination of dissociation limits of H 2 [36], D 2 [37] and HD [38], as well as in measurements of the ground state rotational sequence of H 2 [39], and the vibrational splittings in H 2 , D 2 and HD [40][41][42][43][44].…”

VUV-synchrotron absorption studies of N2 and CO at 900K

“…Campargue and co-workers have recently performed high-resolution determinations of the (2,0) overtone bands of H 2 [46] and D 2 [47] using quantum cascade lasers. Maddaloni et al [48] performed precision measurements using cavity-ring down techniques for the fundamental band of D 2 .…”