Abstract
AbstractLamb-dips of R(0), R(2) and P(2) rovibrational transitions in the (2-0) overtone band of the HD molecule are measured at cryogenic temperatures using the technique of NICE-OHMS spectroscopy. Resulting transition frequencies are $$214\,905\,335\,240\,(100)$$
214
905
335
240
(
100
)
kHz for R(0), $$219\,042\,856\,794\,(150)$$
219
042
856
794
(
150
)
kHz for R(2) and $$206 \,898 \,802\,150 \,(150)$$
206
898
802
150
(
150
)
kHz for P(2). Small, but systematic deviations (at 1.7$$\sigma $$
σ
level) are found from advanced ab initio calculations, supporting results from previous studies probing other lines in the (2-0) band. From a combination difference between the R(0) and P(2) lines, an accurate value for rotational-level spacing in the $$v=0$$
v
=
0
ground state is determined, of $$\Delta _{(J=2)-(J=0)}= 8\,006\,533\,168\,(26)$$
Δ
(
J
=
2
)
-
(
J
=
0
)
=
8
006
533
168
(
26
)
kHz, well in agreement with theory (at 0.6$$\sigma $$
σ
). Based on the observation of the dispersive line shape of R(0), the status of proposed models for the elusive line shapes of saturated transitions in HD is discussed.
Funder
Nederlandse Organisation of Scientific Research
Publisher
Springer Science and Business Media LLC
Subject
Atomic and Molecular Physics, and Optics
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