5 research outputs found
Rotation and RotationāVibration Spectroscopy of the 0<sup>+</sup>ā0<sup>ā</sup> Inversion Doublet in Deuterated Cyanamide
The pure rotation spectrum of deuterated
cyanamide was recorded
at frequencies from 118 to 649 GHz, which was complemented by measurement
of its high-resolution rotation-vibration spectrum at 8ā350
cm<sup>ā1</sup>. For D<sub>2</sub>NCN the analysis revealed
considerable perturbations between the lowest <i>K</i><sub><i>a</i></sub> rotational energy levels in the 0<sup>+</sup> and 0<sup>ā</sup> substates of the lowest inversion doublet.
The final data set for D<sub>2</sub>NCN exceeded 3000 measured transitions
and was successfully fitted with a Hamiltonian accounting for the
0<sup>+</sup> ā 0<sup>ā</sup> coupling. A smaller data
set, consisting only of pure rotation and rotation-vibration lines
observed with microwave techniques was obtained for HDNCN, and additional
transitions of this type were also measured for H<sub>2</sub>NCN.
The spectroscopic data for all three isotopic species were fitted
with a unified, robust Hamiltonian allowing confident prediction of
spectra well into the terahertz frequency region, which is of interest
to contemporary radioastronomy. The isotopic dependence of the determined
inversion splitting, Ī<i>E</i> = 16.4964789(8), 32.089173(3),
and 49.567770(6) cm<sup>ā1</sup>, for D<sub>2</sub>NCN, HDNCN,
and H<sub>2</sub>NCN, respectively, is found to be in good agreement
with estimates from a simple reduced quartic-quadratic double minimum
potential
Rotation and RotationāVibration Spectroscopy of the 0<sup>+</sup>ā0<sup>ā</sup> Inversion Doublet in Deuterated Cyanamide
The pure rotation spectrum of deuterated
cyanamide was recorded
at frequencies from 118 to 649 GHz, which was complemented by measurement
of its high-resolution rotation-vibration spectrum at 8ā350
cm<sup>ā1</sup>. For D<sub>2</sub>NCN the analysis revealed
considerable perturbations between the lowest <i>K</i><sub><i>a</i></sub> rotational energy levels in the 0<sup>+</sup> and 0<sup>ā</sup> substates of the lowest inversion doublet.
The final data set for D<sub>2</sub>NCN exceeded 3000 measured transitions
and was successfully fitted with a Hamiltonian accounting for the
0<sup>+</sup> ā 0<sup>ā</sup> coupling. A smaller data
set, consisting only of pure rotation and rotation-vibration lines
observed with microwave techniques was obtained for HDNCN, and additional
transitions of this type were also measured for H<sub>2</sub>NCN.
The spectroscopic data for all three isotopic species were fitted
with a unified, robust Hamiltonian allowing confident prediction of
spectra well into the terahertz frequency region, which is of interest
to contemporary radioastronomy. The isotopic dependence of the determined
inversion splitting, Ī<i>E</i> = 16.4964789(8), 32.089173(3),
and 49.567770(6) cm<sup>ā1</sup>, for D<sub>2</sub>NCN, HDNCN,
and H<sub>2</sub>NCN, respectively, is found to be in good agreement
with estimates from a simple reduced quartic-quadratic double minimum
potential
Rotation and RotationāVibration Spectroscopy of the 0<sup>+</sup>ā0<sup>ā</sup> Inversion Doublet in Deuterated Cyanamide
The pure rotation spectrum of deuterated
cyanamide was recorded
at frequencies from 118 to 649 GHz, which was complemented by measurement
of its high-resolution rotation-vibration spectrum at 8ā350
cm<sup>ā1</sup>. For D<sub>2</sub>NCN the analysis revealed
considerable perturbations between the lowest <i>K</i><sub><i>a</i></sub> rotational energy levels in the 0<sup>+</sup> and 0<sup>ā</sup> substates of the lowest inversion doublet.
The final data set for D<sub>2</sub>NCN exceeded 3000 measured transitions
and was successfully fitted with a Hamiltonian accounting for the
0<sup>+</sup> ā 0<sup>ā</sup> coupling. A smaller data
set, consisting only of pure rotation and rotation-vibration lines
observed with microwave techniques was obtained for HDNCN, and additional
transitions of this type were also measured for H<sub>2</sub>NCN.
The spectroscopic data for all three isotopic species were fitted
with a unified, robust Hamiltonian allowing confident prediction of
spectra well into the terahertz frequency region, which is of interest
to contemporary radioastronomy. The isotopic dependence of the determined
inversion splitting, Ī<i>E</i> = 16.4964789(8), 32.089173(3),
and 49.567770(6) cm<sup>ā1</sup>, for D<sub>2</sub>NCN, HDNCN,
and H<sub>2</sub>NCN, respectively, is found to be in good agreement
with estimates from a simple reduced quartic-quadratic double minimum
potential
Rotation and RotationāVibration Spectroscopy of the 0<sup>+</sup>ā0<sup>ā</sup> Inversion Doublet in Deuterated Cyanamide
The pure rotation spectrum of deuterated
cyanamide was recorded
at frequencies from 118 to 649 GHz, which was complemented by measurement
of its high-resolution rotation-vibration spectrum at 8ā350
cm<sup>ā1</sup>. For D<sub>2</sub>NCN the analysis revealed
considerable perturbations between the lowest <i>K</i><sub><i>a</i></sub> rotational energy levels in the 0<sup>+</sup> and 0<sup>ā</sup> substates of the lowest inversion doublet.
The final data set for D<sub>2</sub>NCN exceeded 3000 measured transitions
and was successfully fitted with a Hamiltonian accounting for the
0<sup>+</sup> ā 0<sup>ā</sup> coupling. A smaller data
set, consisting only of pure rotation and rotation-vibration lines
observed with microwave techniques was obtained for HDNCN, and additional
transitions of this type were also measured for H<sub>2</sub>NCN.
The spectroscopic data for all three isotopic species were fitted
with a unified, robust Hamiltonian allowing confident prediction of
spectra well into the terahertz frequency region, which is of interest
to contemporary radioastronomy. The isotopic dependence of the determined
inversion splitting, Ī<i>E</i> = 16.4964789(8), 32.089173(3),
and 49.567770(6) cm<sup>ā1</sup>, for D<sub>2</sub>NCN, HDNCN,
and H<sub>2</sub>NCN, respectively, is found to be in good agreement
with estimates from a simple reduced quartic-quadratic double minimum
potential
Rotation and RotationāVibration Spectroscopy of the 0<sup>+</sup>ā0<sup>ā</sup> Inversion Doublet in Deuterated Cyanamide
The pure rotation spectrum of deuterated
cyanamide was recorded
at frequencies from 118 to 649 GHz, which was complemented by measurement
of its high-resolution rotation-vibration spectrum at 8ā350
cm<sup>ā1</sup>. For D<sub>2</sub>NCN the analysis revealed
considerable perturbations between the lowest <i>K</i><sub><i>a</i></sub> rotational energy levels in the 0<sup>+</sup> and 0<sup>ā</sup> substates of the lowest inversion doublet.
The final data set for D<sub>2</sub>NCN exceeded 3000 measured transitions
and was successfully fitted with a Hamiltonian accounting for the
0<sup>+</sup> ā 0<sup>ā</sup> coupling. A smaller data
set, consisting only of pure rotation and rotation-vibration lines
observed with microwave techniques was obtained for HDNCN, and additional
transitions of this type were also measured for H<sub>2</sub>NCN.
The spectroscopic data for all three isotopic species were fitted
with a unified, robust Hamiltonian allowing confident prediction of
spectra well into the terahertz frequency region, which is of interest
to contemporary radioastronomy. The isotopic dependence of the determined
inversion splitting, Ī<i>E</i> = 16.4964789(8), 32.089173(3),
and 49.567770(6) cm<sup>ā1</sup>, for D<sub>2</sub>NCN, HDNCN,
and H<sub>2</sub>NCN, respectively, is found to be in good agreement
with estimates from a simple reduced quartic-quadratic double minimum
potential