High resolution diode laser measurements on the ν2 bands of 14NH3 and 15NH31

Job, V.A.; Patel, N.D.; D'Cunha, R.; Kartha, V. B.

doi:10.1016/0022-2852(83)90005-x

Cited by 31 publications

(10 citation statements)

References 32 publications

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“…A summary of the microwave investigations of the ground state inversion spectra prior to 1975 is provided by Poynter and Kakar [48]. Infrared investigations of the m 2 band have been performed using grating spectrometers [53], Fourier-transform spectrometers [54][55][56][57][58][59][60], and tunable-diode-laser spectrometers [61][62][63]. In this paper, we report an innovative spectrometer that generates coherent radiation in the 200-1600 GHz region and its application to the ammonia molecule.…”

Section: Introductionmentioning

confidence: 97%

Measurements of 14NH3 in the ν2=1 state by a solid-state, photomixing, THz spectrometer, and a simultaneous analysis of the microwave, terahertz, and infrared transitions between the ground and ν2 inversion–rotation levels

Chen

Pearson

Pickett

et al. 2006

Journal of Molecular Spectroscopy

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Section: Introductionmentioning

confidence: 97%

Measurements of 14NH3 in the ν2=1 state by a solid-state, photomixing, THz spectrometer, and a simultaneous analysis of the microwave, terahertz, and infrared transitions between the ground and ν2 inversion–rotation levels

Chen

Pearson

Pickett

et al. 2006

Journal of Molecular Spectroscopy

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“…There has been a lot of work studying the H-B-N system, including aminoborane ͑NH 2 BH 2 ͒, 10,11 imodoborane ͑NHBH͒, 12 gas-phase borane ͑BH 3 ͒, 13,14 ammonia ͑NH 3 ͒, [15][16][17] and other related compounds. From a chemical point of view, ammonia borane is an unusual bonding system involving hydrogen-hydrogen interaction between the protonic ͑NH͒ and hydridic ͑BH͒ hydrogen atoms of adjacent molecules.…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopy study of ammonia borane at high pressure

Lin

Mao

Drozd

et al. 2008

The Journal of Chemical Physics

100

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Ammonia borane, NH(3)BH(3), has attracted significant interest as a promising candidate material for hydrogen storage. The effect of pressure on the bonding in NH(3)BH(3) was investigated using Raman spectroscopy to over 20 GPa in a diamond anvil cell, and two new transitions were observed at approximately 5 and 12 GPa. Vibrational frequencies for the modes of the NH(3) proton donor group exhibited negative pressure dependence, which is consistent with the behavior of conventional hydrogen bonds, while the vibrational frequencies of the BH(3) proton acceptor group showed positive pressure dependence. The observed behavior of these stretching modes supports the presence of dihydrogen bonding at high pressure. In addition, the BH(3) and NH(3) bending modes showed an increase in spectral complexity with increasing pressure together with a discontinuity in d nu/d P which suggests rotational disorder in this molecule. These results may provide guidance for understanding and developing improved hydrogen storage materials.

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“…by GrØgoire et al [4,21] The rotational constant of ammonia about its symmetry axis is 6.228 cm À1 , [22] while the rotational constant of the spherical rotor NH 4 C is 5.674 cm À1 , determined from a rotationally resolved photoelectron spectrum. [23] This difference between the rotational constants of NH 3 and NH 4 C is similar to the reduction of F, which we observe in the phenolammonia cluster upon electronic excitation.…”

Section: Phenol(nh 3 )mentioning

confidence: 99%

Torsional Barriers in Aromatic Molecular Clusters as Probe of the Electronic Properties of the Chromophore

Jacoby

Schmitt

2004

ChemPhysChem

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We present a computer program that is capable of fitting n-fold torsional barriers Vn (n = 2-6) and torsional constants F simultaneously to high- and low-resolution spectroscopic data of different isotopomeric internal rotors. The program has been utilized to fit independently barriers and torsional constants for both electronic states of several aromatic clusters. The constant F of the ammonia moiety in the phenol-ammonia cluster is shown to decrease upon electronic excitation, thus imaging the formation of a hydrogen-bonded complex between the phenoxy radical and the NH4 radical in the excited state. In contrast, for the naphthol-ammonia 1:1 clusters no change of F of ammonia could be found. For phenol-methanol cluster we found a decrease of F upon excitation which points to a stronger hydrogen bond between phenol and methanol in the excited state. A strong reduction of the torsional barrier upon excitation points to the formation of a methoxonium radical in a similar photoreaction as in phenol-ammonia cluster. For the phenol-water system we postulate the same mechanism, a photoreaction, which leads to a translocated hydrogen atom in the S1 state what can be deduced from the change of the torsional constant upon electronic excitation.

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High resolution diode laser measurements on the ν2 bands of 14NH3 and 15NH31

Cited by 31 publications

References 32 publications

Measurements of 14NH3 in the ν2=1 state by a solid-state, photomixing, THz spectrometer, and a simultaneous analysis of the microwave, terahertz, and infrared transitions between the ground and ν2 inversion–rotation levels

Measurements of 14NH3 in the ν2=1 state by a solid-state, photomixing, THz spectrometer, and a simultaneous analysis of the microwave, terahertz, and infrared transitions between the ground and ν2 inversion–rotation levels

Raman spectroscopy study of ammonia borane at high pressure

Torsional Barriers in Aromatic Molecular Clusters as Probe of the Electronic Properties of the Chromophore

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