Patterns in synchrotron near-free-rotor FIR spectra of CH3OH and CD3OH – The tau of methanol

2020 ◽  
Vol 1209 ◽  
pp. 127960
Author(s):  
R.M. Lees ◽  
Li-Hong Xu ◽  
B.E. Billinghurst
Keyword(s):  
Fir Spectra

Phthalocyanine von Cobalt(III): Darstellung, Resonanz-Raman-, Infrarot- und elektronische Absorptionsspektren von [CoX2Pc(1—)] (X = Cl, Br) and [CoX2Pc(2-)]- (X = OH, F, CI, Br)

1984 ◽  
Vol 39 (11) ◽  
pp. 1490-1499 ◽  
Author(s):  
H. Homborg ◽  
W. Kalz
Keyword(s):  
Electron Transfer ◽  
Stretching Vibration ◽  
Fir Spectra

Abstract The preparation of anionic phthalocyaninato-cobaltates(III) [CoX2Pc(2-)]- (X = OH . F, CI, Br) is described. The UV -VIS. IR and Resonance-R am an (RR ) spectra are measured and com pared with those of the complexes [CoX2Pc(1 -)] (X = Cl, Br) containing the phthalocyanine-π-cation- radical.The characteristic spectroscopical differences for the Pc(1-)- and Pc(2-)-Ligands are discussed. Besides the typical B-, Q- and N-transitions of the Pc(1 -)- and Pc(2 -)-ligand additional weak bands are observed in the UV -VIS spectra for both dichloro- and dibromocomplexes. These bands are assigned to X (π , σ) → Co electron transfer a2u(πx), a2u(σx) → a1g(d); for the Pc(1 - )-complexes Cl(π) is at 22.9, Cl(σ) at 38.9. Br(π-) at 19.6 and Br(σ) at 36.4 kK. For the Pc(2-)-complexes these bands are slightly red-shifted by about 0.5 kK. The assignment is confirm ed by the RR-spectra. For both dichloro- and dibromo-complexes the sym. (Co-X)- stretching vibration (a1g, ν1) is strongly RR-enhanced and up to four overtones of ν1 are observed (for Pc(2-): ν ( Co - X ) for X = Cl: 270. Br: 165 cm-1; for Pc ( 1 - ) : X = Cl: 280. Br: 168 cm-1). The antisym. (Co -X)-stretching vibration (a2u) is observed in the FIR spectra (for Pc(2 -): ν(Co-X) for X = F: 546. Cl: 333. Br: 243 cm-1; for Pc ( 1 - ) : X = Cl: 326. Br: 250 cm-1).

[Al2P4]6-, [Al2As4]6-, [Ga2P4]6- und [Ga2As4]6-, Zintl-Anionen mit 1,3-Dimethylencyclobutan-Struktur / [Al2P4]6-, [Al2As4]6-, [Ga2P4]6- and [Ga2As4]6-, Zintl Anions with 1.3-Dimethylene-cyclobutane Structure

1991 ◽  
Vol 46 (6) ◽  
pp. 789-794 ◽  
Author(s):  
M. Somer ◽  
D. Thiery ◽  
K. Peters ◽  
L. Walz ◽  
M. Hartweg ◽  
...  
Keyword(s):  
Bond Order ◽  
Factor Group ◽  
Unit Cell ◽  
Normal Coordinate Analysis ◽  
Monoclinic Space Group ◽  
Partial Structure ◽  
Normal Coordinate ◽  
Space Group ◽  
Single Bonds ◽  
Fir Spectra

The compounds Cs6M2X4 (M = Al, Ga; X = P, As) were synthesized from stoichiometric mixtures of Cs, M and Cs4X6 in sealed Nb ampoules at 950 K. They are isotypic and crystallize in the monoclinic space group P21/c (No. 14) with Z = 4 formula units per unit cell. The anion partial structure is characterized by isolated [M2X4]6- units with relatively short distances for the terminal d(M–X) bonds corresponding to a Pauling Bond Order PBO = 1.5. The distances d(M–X) of the four-membered M2X2 rings correspond to single bonds.The FIR spectra have been interpreted on the basis of the [M2X4]6- units with 2/m 2/m 2/m-D2h, symmetry by considering a factor group splitting. The assignment of the observed frequencies is supported by a normal coordinate analysis.

scholarly journals The optical selection rules of a graphene quantum dot in external electric fields

RSC Advances ◽  
2017 ◽  
Vol 7 (37) ◽  
pp. 22771-22776 ◽  
Author(s):  
Qing-Rui Dong ◽  
Chun-Xiang Liu
Keyword(s):  
Quantum Dot ◽  
Electric Fields ◽  
Selection Rules ◽  
Graphene Quantum Dot ◽  
External Electric Fields ◽  
Fir Spectra

We study theoretically the triangular zigzag graphene quantum dot in electric fields and find that there exist the remarkable optical selection rules in the FIR spectra.

Corrigendum to “The inversion splitting of 15NH2D and 15ND2H as obtained from their microwave and FIR Spectra” [J. Mol. Spectrosc. 251 (2008) 90–101]

2010 ◽  
Vol 260 (2) ◽  
pp. 139-140 ◽  
Author(s):  
M. Elkeurti ◽  
L.H. Coudert ◽  
J. Orphal ◽  
G. Wlodarczak ◽  
C.E. Fellows ◽  
...  
Keyword(s):  
Fir Spectra

The inversion splitting of 15NH2D and 15ND2H as obtained from their microwave and FIR spectra

2008 ◽  
Vol 251 (1-2) ◽  
pp. 90-101 ◽  
Author(s):  
M. Elkeurti ◽  
L.H. Coudert ◽  
J. Orphal ◽  
G. Wlodarczak ◽  
C.E. Fellows ◽  
...  
Keyword(s):  
Fir Spectra

FIR spectra of amino acids and related molecules

1984 ◽  
Vol 24 (2-3) ◽  
pp. 201-208 ◽  
Author(s):  
S.K. Husain ◽  
J.B. Hasted ◽  
D. Rosen ◽  
E. Nicol ◽  
J.R. Birch
Keyword(s):  
Amino Acids ◽  
Fir Spectra

Darstellung, Eigenschaften und elektronische Raman-Spektren von Di(bromo)phthalocyaninatometallaten(III) der Eisengruppe / Synthesis, Properties and Electronic Raman Spectra of Di(bromo)phthalocyaninatometalates(III) of the Iron Group Elements

1994 ◽  
Vol 49 (1) ◽  
pp. 50-56 ◽  
Author(s):  
Svend Sievertsen ◽  
Hendrik Schlehahn ◽  
Heiner Homborg
Keyword(s):  
Raman Spectra ◽  
Ground State ◽  
Electronic Spectra ◽  
Spin Orbit ◽  
Iron Group ◽  
Orbit Splitting ◽  
Spin Orbit Splitting ◽  
Synthesis Properties ◽  
Ct Transitions ◽  
Fir Spectra

Abstract Low spin di(bromo)phthalocyaninatometalates of tervalent iron, ruthenium and osmium ([MBr2Pc2-]-) are formed by the reaction of [FeBrPc2-] or H[MBr2Pc2-] (M = Ru, Os) with excess bromide in DMF or THF and isolated as (nBu4N)+ salts. The electronic spectra show the typical π- π*- transitions (B, Q, N region) of the Pc2- ligand together with a number of extra bands due to trip-multiplett and (Pc, Br → M)CT transitions. νs(MBr) is observed in the resonance Raman (RR) spectrum (RR enhanced for M = Fe, Ru) at 161 cm-1 (Fe), 183 cm-1 (Ru) and 192 cm-1 (Os), νas(MBr) at 251 cm-1 (Fe), 234 cm-1 (Ru) and 218 cm-1 (Os) in the FIR spectra. The RR spectra obtained by excitation at low absorbance between the B and Q region are dominated by the intraconfigurational " Γ7 →Γ 8" transition due to spin orbit splitting of the 2T2g ground state for Fe at 583 cm-1, Ru at 1026/1050 cm-1 and Os at 3131 cm-1 . In the MIR resp. NIR spectra vibronically induced transitions are observed for the Ru or Os complex.

scholarly journals G54.4–0.3 — Multi-Frequency Investigation of an SNR in Interaction with the ISM

1996 ◽  
Vol 169 ◽  
pp. 627-628
Author(s):  
N. Junkes
Keyword(s):  
Interstellar Medium ◽  
Northern Hemisphere ◽  
Supernova Remnant ◽  
Galactic Plane ◽  
Point Sources ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
Shell Type ◽  
Fir Spectra

G54.4–0.3 is an extended shell-type supernova remnant (SNR) in the Galactic plane. We selected this source as a candidate for the interaction of SNRs with the interstellar medium on the base of an investigation of cool IRAS point sources in the direction of SNRs. We found a statistical excess of IRAS sources with FIR spectra similar to young stellar objects (Td ≈ 25 − 45 K) in the vicinity of G54.4–0.3 and a number of other SNRs in the northern hemisphere (Junkes & Fürst 1992).

Far infrared (FIR) spectra of polynary chalcogenide glasses

1974 ◽  
Vol 15 (3) ◽  
pp. 526-530 ◽  
Author(s):  
Eva-Maria Amrhein ◽  
Delbert E. Day ◽  
Norbert J. Kreidel ◽  
J.H. Weaver
Keyword(s):  
Chalcogenide Glasses ◽  
Far Infrared ◽  
Fir Spectra
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