Electric dipole moment of formaldehyde in the first 3A2 excited state

1970 ◽  
Vol 48 (10) ◽  
pp. 1242-1253 ◽  
Author(s):  
A. D. Buckingham ◽  
D. A. Ramsay ◽  
J. Tyrrell
Keyword(s):  
Dipole Moment ◽  
Excited State ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Stark Effect ◽  
A Value ◽  
Parallel Polarization ◽  
And Shifts ◽  
Field Strengths

The Stark effect on the rotational lines of the 1+–0 band of the 3A2–1A1 (π* ← n) transition of formaldehyde has been studied using field strengths up to 25 kV/cm. Measurements of the Stark splittings and shifts for the Q3(3, 3), R2(3, 3), Q2(3, 3), and Q2(5, 5) lines in parallel polarization lead to a value of 1.29 ± 0.03 D for the dipole moment of formaldehyde in its 3A2-excited state. This value is significantly smaller than the value (μ′ = 1.56 ± 0.07 D) obtained by Freeman and Klemperer for the corresponding 1A2-excited state. A few measurements on lines of the 0+–0 band of the 3A2–1A1 system show that the Stark splittings and shifts are closely similar (± 3%) to those for the 1+–0 band.The spin constants for the 3A2 state have been redetermined and are:[Formula: see text]The Stark splittings show conclusively that the line assigned in earlier work as R1(3, 3) is indeed a Q2(3, 3) line in agreement with the intensity formulas of Hougen.

Electric Dipole Moment of Propynal in the ã3A′ State

1973 ◽  
Vol 51 (23) ◽  
pp. 2444-2447 ◽  
Author(s):  
Ronald Y. Dong ◽  
D. A. Ramsay
Keyword(s):  
Dipole Moment ◽  
Excited State ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Stark Effect ◽  
A Value ◽  
Parallel Polarization ◽  
Field Strengths

The Stark effect on the rotational lines of the 0–0 band of the [Formula: see text] system of propynal has been studied with field strengths up to 20 kV/cm. Measurements of the Stark shifts and splittings for the qQQ2(7,7), qQQ2(8,8), and qQQ2(9,9) lines in parallel polarization lead to a value of µa′ = 0.5 ± 0.1 D for the dipole moment of propynal in the ã3A″ excited state.

The electric dipole moment of the state of thioformaldehyde

1981 ◽  
Vol 59 (11) ◽  
pp. 1635-1639 ◽  
Author(s):  
W. Goetz ◽  
D. C. Moule ◽  
D. A. Ramsay
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Stark Effect ◽  
Large Change ◽  
The State ◽  
Large Decrease ◽  
Stark Broadening ◽  
A Value ◽  
Analogous Transition

The Stark effect on the [Formula: see text] system of H2CS has been investigated. An analysis of the Stark broadening of the lines in the pP3 branch with J″ = 3–8 yields a value of μ′ = −2.2 ± 0.3 D. The large decrease in dipole moment on excitation (μ′ = −3.85 D) is consistent with the large change in dipole moment which has been predicted for the analogous transition in H2CO.

Microwave Spectrum and Dipole Moment of Methylenecyclobutenone

1974 ◽  
Vol 29 (10) ◽  
pp. 1498-1500 ◽  
Author(s):  
W. Czieslik ◽  
L. Carpentier ◽  
D. H. Sutter
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Ground State ◽  
Stark Effect ◽  
Microwave Spectrum ◽  
Least Square ◽  
Rotational Constants ◽  
Vibrational Ground State ◽  
Least Square Fit

Abstract The microwave spectrum of Methylenecyclobutenone has been investigated in the vibrational ground state in the range of 8 to 26.5 GHz. From a least square fit of 12 lines with J ≦ 4 the rotational constants have been calculated as A =5.775664±0.000009 GHz, B = 4.312314 ± 0.000007 GHz, C = 2.467814±0.000008 GHz. The inertia defect Δ = - 0.09 amuÅ2 indicates that the molecule is planar. From Stark-effect measurements the components of the molecular electric dipole moment were obtaied as |μa| = 2.04 ± 0.02 D, |μb| = 2.70±0.03 D, |μtotal| = 3.39 ± 0.05 D.

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.

Electroabsorption spectra of push–pull porphyrins in solution and in solid films

2015 ◽  
Vol 19 (01-03) ◽  
pp. 527-534
Author(s):  
Kamlesh Awasthi ◽  
Hung-Yu Hsu ◽  
Hung-Chu Chiang ◽  
Chi-Lun Mai ◽  
Chen-Yu Yeh ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Excited State ◽  
Charge Transfer ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Ground State ◽  
Benzene Solution ◽  
Solid Films ◽  
The One ◽  
Interfacial Charge

Polarized electroabsorption (E-A) spectra of highly efficient porphyrin sensitizers (YD2 and YD2-oC8) have been measured in benzene solution. Polarized E-A spectra of these push–pull porphyrins embedded in poly(methyl methacrylate) films or sensitized on TiO 2 films are also observed. Based on the analysis of the E-A spectra, the magnitude of the electric dipole moment both in the ground state and in the lowest excited state have been evaluated in solution and in solid films. The electric dipole moment in the excited state of these compounds is very large on TiO 2 films, suggesting the interfacial charge transfer on TiO 2 surface following photoexcitation of porphyrin dyes. The electric dipole moment in the excited state evaluated from the E-A spectra is very different from the one evaluated from the electrophotoluminescence spectra on TiO 2, suggesting that the strong local field of TiO 2 films is applied to the fluorescing dyes attached to TiO 2 films.

Elektrisches Dipolmoment und Mikrowellen- rotationsspektrum von SiS

1969 ◽  
Vol 24 (9) ◽  
pp. 1422-1423 ◽  
Author(s):  
J. Hoeft ◽  
F.J. Lovas ◽  
T. Törring
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Stark Effect ◽  
Rotational Transitions

Abstract Stark effect measurements on pure rotational transitions of SiS are described. Measurements on the ground vibra-tional state of the most abundant molecule resulted in the following electric dipole moment:

Rotational Spectrum , Electric Dipole Moment, Quadrupole Coupling , and Partial r0- Structure of 3 -Cyanothiophene

1977 ◽  
Vol 32 (8) ◽  
pp. 890-896 ◽  
Author(s):  
J. Wiese ◽  
D. H. Sutter
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Stark Effect ◽  
Quadrupole Coupling Constant ◽  
Abundant Species ◽  
Rotational Spectrum ◽  
Quadrupole Coupling ◽  
Centrifugal Distortion Constants ◽  
Ring Distortion

Abstract The microwave rotational spectrum of the most abundant species of 3-Cyanothiophene was investigated for the ground vibrational state. Rotational constants and centrifugal distortion constants are given. The electric dipole moment components μa and μb and the 14N-quadrupole coupling constant X + = X bb + X cc were determined from the Stark-effect splittings and hfs-splittings respectively. The experimental results are compared to CNDO/2 calculations and are discussed with reference to ring distortion.

The Microwave Spectrum of Cyanogen Iodide-15N: Hyperfine Structure and Electric Dipole Moment Investigated by Microwave Fourier Transform Spectroscopy

1988 ◽  
Vol 43 (2) ◽  
pp. 133-137 ◽  
Author(s):  
Joachim Gripp ◽  
Helmut Dreizler
Keyword(s):  
Fourier Transform ◽  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Stark Effect ◽  
Rotational Transition ◽  
Microwave Spectrum ◽  
Spin Rotation ◽  
Coupling Parameters ◽  
Cyanogen Iodide

The first rotational transition of cyanogen iodide-15N (IC15N) has been investigated by microwave Fourier transform (MWFT) Stark effect spectroscopy to determine the electric dipole moment. In addition the first four rotational transitions have been measured by MWFT spectroscopy to obtain accurate parameters for the rotational, quadrupole and spin-rotation coupling parameters.

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