HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: X. ROTATIONAL SPECTRUM OF BUTATRIENE (H2C=C=C=CH2)

1957 ◽  
Vol 35 (8) ◽  
pp. 837-841 ◽  
Author(s):  
B. P. Stoicheff
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
High Resolution ◽  
Rotational Constant ◽  
Rotational Spectrum ◽  
A Value

The rotational Raman spectrum of butatriene (H2C=C=C=CH2) at a pressure of 2 cm. Hg was photographed with a 21 ft. grating spectrograph. An analysis of this spectrum (based on the symmetric top approximation) yields the rotational constant [Formula: see text](B0 + C0) = 0.13141 ± 0.0001 cm−1. If the two outer C=C bonds in butatriene are assumed to have the same length as the C=C bonds in allene,namely 1.309 Å, it is found that the central C=C bond has a length of 1.284 ± 0.006 Å, a value which is shorter than that of the C=C bonds in ethylene and in allene.

HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: VI. ROTATIONAL SPECTRUM OF SYMMETRIC BENZENE-d3

1956 ◽  
Vol 34 (4) ◽  
pp. 350-353 ◽  
Author(s):  
A. Langseth ◽  
B. P. Stoicheff
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
High Resolution ◽  
Rotational Constant ◽  
Benzene Molecule ◽  
Second Order ◽  
Rotational Spectrum ◽  
Internuclear Distances

The pure rotational Raman spectrum of C6H3D3 vapor at a pressure of 15 cm. Hg was photographed in the second order of a 21 ft. grating. The value of the rotational constant was found to be B0 = 0.17165 ± 0.0001 cm−1. This result confirms the earlier spectroscopic values of the internuclear distances in the benzene molecule.

HIGH-RESOLUTION RAMAN SPECTROSCOPY OF GASES: XVII. THE PURE ROTATIONAL RAMAN SPECTRUM OF IODOACETYLENE

1963 ◽  
Vol 41 (12) ◽  
pp. 2098-2101 ◽  
Author(s):  
W. Jeremy Jones ◽  
B. P. Stoicheff ◽  
J. K. Tyler
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
High Resolution ◽  
Bond Length ◽  
Ground State ◽  
Rotational Constant ◽  
Bond Lengths ◽  
A Value

A study of the pure rotational Raman spectrum of iodoacetylene has yielded a value of 0.10622 cm−1 for the ground-state rotational constant. From this value, and from assumed C≡C and C—H bond lengths of 1.203 Å and 1.055 Å respectively, the C—I bond length is calculated to be 1.988 Å.

HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: III. RAMAN SPECTRUM OF NITROGEN

1954 ◽  
Vol 32 (10) ◽  
pp. 630-634 ◽  
Author(s):  
B. P. Stoicheff
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
High Resolution ◽  
Electronic Spectra ◽  
Second Order ◽  
Published Data ◽  
Rotational Spectrum ◽  
Rotational Constants ◽  
Vibrational Constants

The pure rotational spectrum and the Q branch of the 1–0 band of N2 were photographed in the second order of a 21 ft. grating. An analysis of the rotational spectrum yields the rotational constants[Formula: see text]The value of B0 together with the Bν values obtained from the electronic bands of N2 gives[Formula: see text]Revised values of the vibrational constants have also been calculated using the results of the present work and the published data on the electronic spectra.

HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: IV. ROTATIONAL RAMAN SPECTRUM OF CYANOGEN

1954 ◽  
Vol 32 (10) ◽  
pp. 635-638 ◽  
Author(s):  
C. K. Møller ◽  
B. P. Stoicheff
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
High Resolution ◽  
Bond Length ◽  
Second Order ◽  
Single Bond ◽  
Rotational Constants ◽  
A Value ◽  
Symmetric Molecule ◽  
Concave Grating

The rotational Raman spectrum of cyanogen gas at [Formula: see text] atm. pressure has been photographed in the second order of a 21 ft. concave grating spectrograph. The simplicity of the spectrum and the observed intensity alternation of the lines show that C2N2 is a linear symmetric molecule. An analysis of the spectrum yields for the rotational constants[Formula: see text]By assuming a value for the C≡N bond length of 1.157 Å, the length of the C—C single bond was calculated to be 1.380 Å.

HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: XV. ROTATIONAL SPECTRUM AND MOLECULAR STRUCTURE OF CYCLOBUTANE

1962 ◽  
Vol 40 (6) ◽  
pp. 725-731 ◽  
Author(s):  
R. C. Lord ◽  
B. P. Stoicheff
Keyword(s):  
Molecular Structure ◽  
Raman Spectroscopy ◽  
High Resolution ◽  
Bond Length ◽  
Raman Spectra ◽  
Point Group ◽  
Rotational Spectrum ◽  
Rotational Constants ◽  
Group D

An investigation of the rotational Raman spectra of normal and fully deuterated cyclobutane (C4H8 and C4D8) has given values of the rotational constants for these molecules. From these results it was found that the C—C bond length is 1.558 ± 0.003 Å, irrespective of whether cyclobutane belongs to the molecular point group D4h (planar C4 ring) or D2d (puckered C4 ring).

HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: XI. SPECTRA OF CS2 AND CO2

1958 ◽  
Vol 36 (2) ◽  
pp. 218-230 ◽  
Author(s):  
B. P. Stoicheff
Keyword(s):  
Raman Spectroscopy ◽  
High Resolution ◽  
Raman Spectra ◽  
Rotational Structure ◽  
Rotational Spectrum ◽  
Vibrational Constants ◽  
Infrared Data

The vibrational Raman spectra of CS2, C12O2, and C13O2, consisting of the strong Fermi diad ν1, 2ν2 have been photographed with a 21 ft. grating. In the spectrum of CS2, 12 additional sharp Q branches were observed in the region of the diad; three are due to isotopic molecules and the remainder are "hot" bands. The rotational structure of the strong ν1 band was also obtained. These measurements together with infrared data are used to determine the vibrational constants ωi0 and xik of CS2. The pure rotational spectrum of CS2, with rotational lines up to J = 94, yields the constants B000 = 0.10910 ± 0.00005 cm−1, D000 = 1.0 × 10−8 cm−1, and r0(C=S) = 1.5545 ± 0.0003 Å. For C12O2, the rotational structure of the diad was analyzed and the results are in agreement with recent infrared data.

The High Resolution Rotational Spectrum of Silylbromide, SiH381Br

1977 ◽  
Vol 32 (12) ◽  
pp. 1444-1449 ◽  
Author(s):  
K.-F. Dössel ◽  
D. H. Sutter
Keyword(s):  
High Resolution ◽  
Quadrupole Coupling Constant ◽  
Rotational Constant ◽  
Rotational Spectrum ◽  
Coupling Constant ◽  
Hyperfine Transitions ◽  
Quadrupole Coupling ◽  
Nuclear Shielding ◽  
Shielding Tensor ◽  
Centrifugal Distortion Constants

Abstract The microwave spectrum of SiH381Br has been reanalysed in the frequency range 8-40 GHz under high resolution. From 64 observed hyperfine transitions improved values for the rotational constant B = 4292646.2(4) kHz and the quadrupole coupling constant eqQ = 279825(5) kHz were obtained. Furthermore the centrifugal distortion constants DJ = 1.81(1) kHz and DJK = 29.19(4) kHz and the spin-rotation constants CN = -2.32(40) kHz and CK = -34.2(11) kHz were determined. From the values of CN and CK the 81Br nuclear shielding tensor is calculated. An improved value of ∣μ∣ - 1.319(8) D is given for the molecular electric dipole-moment.

scholarly journals Towards refining Raman spectroscopy-based assessment of bone composition

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Furqan A. Shah
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
High Resolution ◽  
Organic Component ◽  
Accurate Estimation ◽  
Band Broadening ◽  
Peak Broadening ◽  
Spectral Peaks ◽  
Intensity Ratios ◽  
Mineral Crystallinity

Abstract Various compositional parameters are derived using intensity ratios and integral area ratios of different spectral peaks and bands in the Raman spectrum of bone. The $$\nu $$ ν 1-, $$\nu $$ ν 2-,$$\nu $$ ν 3-, $$\nu $$ ν 4 PO43−, and $$\nu_{1} $$ ν 1 CO32− bands represent the inorganic phase while amide I, amide III, Proline, Hydroxyproline, Phenylalanine, δ(CH3), δ(CH2), and $$\nu $$ ν (C–H) represent the organic phase. Here, using high-resolution Raman spectroscopy, it is demonstrated that all PO43− bands of bone either partially overlap with or are positioned close to spectral contributions from the organic component. Assigned to the organic component, a shoulder at 393 cm−1 compromises accurate estimation of $$\nu $$ ν 2 PO43− integral area, i.e., phosphate/apatite content, with implications for apatite-to-collagen and carbonate-to-phosphate ratios. Another feature at 621 cm−1 may be inaccurately interpreted as $$\nu $$ ν 4 PO43− band broadening. In the 1020–1080 cm−1 range, the ~ 1047 cm−1$$\nu $$ ν 3 PO43− sub-component is obscured by the 1033 cm−1 Phenylalanine peak, while the ~ 1076 cm−1$$\nu $$ ν 3 PO43− sub-component is masked by the $$\nu $$ ν 1 CO32− band. With $$\nu $$ ν 1 PO43− peak broadening, $$\nu $$ ν 2 PO43− integral area increases exponentially and individual peaks comprising the $$\nu $$ ν 4 PO43− band merge together. Therefore, $$\nu $$ ν 2 PO43− and $$\nu $$ ν 4 PO43− band profiles are sensitive to changes in mineral crystallinity.

Prototype of Illumination-Collection Mode Scanning Near-Field Optical Microscopy and Raman Spectroscopy with Gold Inner-Coated Aperture-Less Pyramidal Probe

2010 ◽  
Vol 459 ◽  
pp. 129-133
Author(s):  
Sumio Hosaka ◽  
Hirokazu Koyabu ◽  
Yusuke Aramomi ◽  
Hayato Sone ◽  
You Yin ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
High Resolution ◽  
Stress Distribution ◽  
Optical Microscopy ◽  
Near Field ◽  
Peak Shift ◽  
Raman Peak ◽  
Optical Images ◽  
Raman Peak Shift

We have prototyped illumination-collection mode scanning near-field optical microscopy (SNOM) and near-field Raman spectroscopy (NFRS) with gold inner-covered aperture-less pyramidal probe in order to study the possibility to detect optical images, and Raman spectrum and Raman peak shift for stress distribution in Si device with high resolution of about 10 nm.

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