Stark spectroscopy with the CO laser: Lamb dip spectra of H217O and H218O in the ν2 fundamental band

1978 ◽  
Vol 56 (6) ◽  
pp. 737-743 ◽  
Author(s):  
J. W. C. Johns ◽  
A. R. W. McKellar
Keyword(s):  
Dipole Moment ◽  
Absorption Spectra ◽  
Vibrational State ◽  
Zero Field ◽  
Level System ◽  
Stark Spectroscopy ◽  
Co Laser ◽  
Saturated Absorption ◽  
Ground Vibrational State ◽  
Laser Stark

Saturated absorption spectra of four different transitions in the ν2 fundamental bands of H217O and H218O have been observed using the technique of intracavity CO laser Stark spectroscopy. The analysis of these spectra yields a direct measurement of the dipole moment change between the ground vibrational state and the ν2 = 1 state of H217O, as well as the zero-field frequencies for the observed transitions. A collision-induced centre dip ('crossover resonance') which occurs in one spectrum is formed in a four-level system that is probably the most nearly isolated of any yet observed.

Elektrisches Dipolmoment von TlBr und TlJ

1971 ◽  
Vol 26 (11) ◽  
pp. 1809-1812 ◽  
Author(s):  
E. Tiemann
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Vibrational State ◽  
Stark Effect ◽  
Dipole Moments ◽  
Electric Dipole Moments ◽  
Ground Vibrational State ◽  
Rotational Transitions

Stark-effect measurements on pure rotational transitions of TlBr and Til are described. The derived electric dipole moments of the most abundant isotopic molecules on the ground vibrational state are:205TL79Br : | μ0| = (4.493 ± 0.050) D , 205Tl127 I | μ 0| =(4.607 ± 0.070) D .The electric dipole moment of 205Tl19F | μ 0|=4.2282 (8) D was used as standard.

Microwave spectrum of morpholine

1969 ◽  
Vol 47 (18) ◽  
pp. 3453-3462 ◽  
Author(s):  
J. J. Sloan ◽  
R. Kewley
Keyword(s):  
Dipole Moment ◽  
Vibrational State ◽  
Microwave Spectrum ◽  
Coupling Constants ◽  
Chair Conformer ◽  
Imino Group ◽  
Ground Vibrational State ◽  
Principal Axes ◽  
Quadrupole Coupling ◽  
Equatorial Conformer

The microwave spectra of morpholine and N-deuteromorpholine have been investigated within the 8 to 40 GHz region. For both the normal and the deuterated species, strong a-type spectra which are due to the chair conformer with an equatorial imino group were recorded. The ground vibrational state rotational constants and quadrupole coupling constants are (in MHz), for normal morpholine, A = 4924.88 ± 0.05, B = 4625.15 ± 0.05, C = 2684.25 ± 0.05, χaa = 2.22 ± 0.02, χbb = 2.51 ± 0.04, χcc = −4.73 ± 0.02, and for N-deuteromorpholine, A = 4925.39 ± 0.05, B = 4399.67 ± 0.05, C = 2607.09 ± 0.05, χaa = 1.92 ± 0.02, χbb = 2.59 ± 0.04, χcc = −4.51 ± 0.02. The rs coordinates of the imino hydrogen are (in Å) aH = 2.373 ± 0.005 and cH = 0.10 ± 0.03. For the normal species the dipole moment components are (in D) μa = 1.68 ± 0.01, μc = 0.30 ± 0.01, μ = 1.71 ± 0.02. The value of aH and the direction of μ with respect to the a and c principal axes confirm that the observed spectrum is that of the chair equatorial conformer of morpholine.

Microwave spectrum and conformation of tetrahydropyran

1969 ◽  
Vol 47 (8) ◽  
pp. 1289-1293 ◽  
Author(s):  
V. M. Rao ◽  
R. Kewley
Keyword(s):  
Dipole Moment ◽  
Vibrational State ◽  
Microwave Spectrum ◽  
Rotational Constants ◽  
Ground Vibrational State ◽  
Chair Form ◽  
Principal Axes

The microwave spectrum of tetrahydropyran has been recorded in the region 8–40 GHz. The rotational constants of the molecule in its ground vibrational state are, in MHz, A = 4673.48 ± 0.05, B = 4495.02 ± 0.11, and C = 2601.31 ± 0.05. The dipole moment components are, in Debye units, μa = 1.53 ± 0.02, μc = 0.82 ± 0.02, and μ = 1.74 ± 0.03. The direction of μ with respect to the principal axes of rotation together with the rotational constants show that the observed spectrum is due to the chair form of tetrahydropyran.

CO2 laser Stark spectroscopy of the ν4 band of SiDF3: The C0 rotational constant and vibrationally induced dipole moment

1989 ◽  
Vol 138 (1) ◽  
pp. 230-245 ◽  
Author(s):  
Kensuke Harada ◽  
Ichirou Nagano ◽  
Susumu Kimura ◽  
Keiichi Tanaka ◽  
Takehiko Tanaka
Keyword(s):  
Dipole Moment ◽  
Co2 Laser ◽  
Rotational Constant ◽  
Stark Spectroscopy ◽  
Induced Dipole ◽  
Laser Stark

Microwave spectrum of allyl cyanide (CH2=CHCH2CN)

1968 ◽  
Vol 46 (8) ◽  
pp. 959-962 ◽  
Author(s):  
K. V. L. N. Sastry ◽  
V. M. Rao ◽  
S. C. Dass
Keyword(s):  
Dipole Moment ◽  
Vibrational State ◽  
Stark Effect ◽  
Microwave Spectrum ◽  
Effect Measurement ◽  
Rotational Constants ◽  
Molecular Dipole ◽  
Ground Vibrational State ◽  
Molecular Dipole Moment ◽  
Rotational Isomers

The microwave spectrum of allyl cyanide (3-butenonitrile) was studied in the region from 8 to 26 GHz. It was confirmed that this molecule exists in the two rotational isomers "cis" and "gauche". In the cis form, both a- and b-type transitions were assigned and the rotational constants in the ground vibrational state were calculated to be A = 11 323.01 + 0.08 MHz, B = 3739.20 ± 0.01 MHz, C = 2858.52 ± 0.01 MHz. The molecular dipole-moment components are μa = 3.26 ± 0.01 D, μb = 2.16 ± 0.05 D, and μt = 3.91 ± 0.03 D. For the gauche form, the a-type transitions were assigned and the rotational constants in the ground vibrational state are A = 17 295 MHz, B = 2619.91 ± 0.1 MHz, C = 2497.52 ± 0.1 MHz. The Stark effect measurement in this case gave the components of the dipole moment as μa = 3.69 ± 0.02 D, ub = 1.11 ± 0.06 D, μc = 0.98 ± 0.07 D, and μt = 3.98 ± 0.03 D.

Stark Spectroscopy with the CO Laser: Dipole Moments, Hyperfine Structure, and Level Crossing Effects in the Fundamental Band of NO

1975 ◽  
Vol 53 (19) ◽  
pp. 2029-2039 ◽  
Author(s):  
A. R. Hoy ◽  
J. W. C. Johns ◽  
A. R. W. McKellar
Keyword(s):  
Hyperfine Structure ◽  
Molecular Beam ◽  
Dipole Moments ◽  
Stark Spectroscopy ◽  
Level Crossing ◽  
Co Laser ◽  
Fundamental Band ◽  
Structure Line ◽  
Infrared Intensities ◽  
Laser Stark

The 9–8 P(13) line of the 12C16O laser (1884.349 cm−1) has been used to study laser Stark Lamb dip spectra associated with the R(3/2) line of the rotation–vibration fundamental band of NO. We have observed fully resolved hyperfine structure (line width ≈ 500 kHz) due to both components, Ω = 3/2 and 1/2, of the 2Π ground state. In addition, two level crossing signals have been observed in the v = 1 vibrational state of the 2Π1/2 component. The values we obtain for the electric dipole moment (in Debye) are:[Formula: see text]It was possible to determine μ′ and μ″ separately for the 2Π1/2 component because of the observation of the level crossing signals, which depend only on μ′. Our result for μ″ of 2Π1/2 agrees, within error limits, with a more precise previous measurement by molecular beam techniques, and our other results are more precise than previous determinations based on infrared intensities.

Microwave Spectrum of 1,3-Dioxane

1972 ◽  
Vol 50 (11) ◽  
pp. 1690-1697 ◽  
Author(s):  
R. Kewley
Keyword(s):  
Dipole Moment ◽  
Vibrational State ◽  
Microwave Spectrum ◽  
Vibrational States ◽  
Rotational Constants ◽  
Ground Vibrational State ◽  
Chair Form ◽  
Rotational Spectra

The microwave spectrum of 1,3-dioxane has been studied within the region 8 to 40 GHz. The rotational constants of the molecule in its ground vibrational state are, in MHz, A = 4999.94(0.05), B = 4807.61 (0.05), and C = 2757.12(0.05). The dipole moment components are, in Debye units, μb = 1.61 (0.02), μc = 1.29(0.01), and μ = 2.06(0.03). The values of the above quantities are consistent with a chair form structure. Rotational spectra due to five excited vibrational states of 1,3-dioxane have been assigned.

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