Shape and width of IR absorption lines of ammonia expanded in a supersonic jet

1988 ◽  
Vol 47 (3) ◽  
pp. 277-282 ◽  
Author(s):  
M. Snels ◽  
G. Baldacchini
Keyword(s):  
Supersonic Jet ◽  
Absorption Lines ◽  
Ir Absorption

Interaction energy of water dimers from pressure broadening of near-IR absorption lines

2008 ◽  
Vol 462 (4-6) ◽  
pp. 188-191 ◽  
Author(s):  
Phyllis A.Y. Fiadzomor ◽  
Anthony M. Keen ◽  
Robert B. Grant ◽  
Andrew J. Orr-Ewing
Keyword(s):  
Interaction Energy ◽  
Absorption Lines ◽  
Ir Absorption ◽  
Pressure Broadening ◽  
Near Ir ◽  
Water Dimers

SPECTROSCOPIC PROPERTIES OF B2O3–PbO–Nd2O3 GLASSES

1999 ◽  
Vol 13 (24) ◽  
pp. 879-884 ◽  
Author(s):  
V. SIMON ◽  
I. ARDELEAN ◽  
I. MILEA ◽  
M. PETEANU ◽  
S. SIMON
Keyword(s):  
Glass Matrix ◽  
Spectroscopic Properties ◽  
Glass System ◽  
Absorption Lines ◽  
Local Order ◽  
Ir Absorption ◽  
Lead Borate ◽  
Absorption Bands ◽  
Lanthanide Ion ◽  
Radiative Transitions

Samples belonging to x Nd 2 O 3(100-x) [ 2B 2 O 3· PbO ] glass system, with 0≤ x≤ 40 mol%, are investigated by IR and UV–VIS spectroscopies in order to obtain evidence for the influence of Nd 2 O 3 on the local order from 2B 2 O 3· PbO glass matrix. Besides the IR absorption bands characteristic to lead and boron arrangements, typical absorption lines of Nd 3+ ions around 4000 cm -1 and 6000 cm -1 are recorded. The 6000 cm -1 band appears only for the samples with x≥25 mol% Nd 2 O 3. The split of some UV–VIS absorption bands arising from transitions of neodymium ions in doublet lines as well as the shift of the absorption bands as the Nd 2 O 3 content increases denote the influence of the lead–borate matrix on the radiative transitions of the lanthanide ion.

Infrared Absorption from Low Carbon Concentration, Low Dose, Annealed CZ Silicon

2007 ◽  
Vol 131-133 ◽  
pp. 207-212 ◽  
Author(s):  
N. Inoue ◽  
Y. Goto ◽  
T. Sugiyama
Keyword(s):  
Infrared Absorption ◽  
Carbon Concentration ◽  
Low Dose ◽  
Absorption Lines ◽  
Ir Absorption ◽  
Absorption Analysis ◽  
Low Carbon ◽  
Dose Irradiation ◽  
Highly Sensitive ◽  
Order Of Magnitude

Complexes formed by low dose irradiation with electron (1015-16/cm2) and He (5x1012- 5x1013/cm2) in the relatively low carbon concentration (1016/cm3) MCZ silicon were investigated by highly sensitive and quantitative IR absorption analysis. CiOi and VO were the main complexes in all cases. The concentration of these complexes was about 1015/cm3, or 10% of included carbon in the highest case. Loss of almost equal amount of Cs was observed. The concentration of CiOiI was one order of magnitude lower. Upon annealing, these lines weakened and almost disappeared at 400 oC. There were some absorption lines introduced by the annealing. VO2 was strongest among them and CsOi related structure was also confirmed. There were absorption lines at 954.9 and 962.6 cm-1 appeared after annealing at 300 oC.

Anomalous shape of the IR absorption lines in an expanding molecular beam of ammonia

1984 ◽  
Vol 41 (13) ◽  
pp. 439-442 ◽  
Author(s):  
G. Baldacchini ◽  
S. Marchetti ◽  
V. Montelatici
Keyword(s):  
Molecular Beam ◽  
Absorption Lines ◽  
Ir Absorption ◽  
Anomalous Shape

scholarly journals Anharmonicity in the mid-infrared spectra of polycyclic aromatic hydrocarbons: molecular beam spectroscopy and calculations

2019 ◽  
Vol 628 ◽  
pp. A130 ◽  
Author(s):  
A. K. Lemmens ◽  
D. B. Rap ◽  
J. M. M. Thunnissen ◽  
C. J. Mackie ◽  
A. Candian ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Infrared Spectra ◽  
Aromatic Hydrocarbons ◽  
Molecular Beam ◽  
Supersonic Jet ◽  
Ir Absorption ◽  
Mid Infrared ◽  
Out Of Plane ◽  
Polycyclic Aromatic ◽  
Combination Bands

Aims. In this work we determine the effects of anharmonicity on the mid-infrared spectra of the linear polycyclic aromatic hydrocarbons (PAHs) naphthalene, anthracene, tetracene and pentacene recorded using the free electron laser FELIX. Methods. Comparison of experimental spectra obtained under supersonic jet conditions with theoretically predicted spectra was used to show if anharmonicity explicitly needs to be taken into account. Results. Anharmonic spectra obtained using second-order vibrational perturbation theory agree on average within 0.5% of the experimental frequencies. Importantly, they confirm the presence of combination bands with appreciable intensity in the 5–6 μm region. These combination bands contain a significant fraction of the IR absorption, which scales linearly with the size of the PAH. Detection and assignment of the combination bands are a preliminary indication of the accuracy of far-IR modes in our anharmonic theoretical spectra. Detailed analysis of the periphery-sensitive CH out-of-plane band of naphthalene reveals that there is still room for improvement of the VPT2 approach. In addition, the implications of our findings for the analysis of the aromatic infrared bands are discussed.

Shape and width of IR absorption lines across supersonic free jets

1984 ◽  
Vol 107 (1) ◽  
pp. 31-34 ◽  
Author(s):  
M.A. Gaveau ◽  
D. Boscher ◽  
J.P. Martin
Keyword(s):  
Absorption Lines ◽  
Ir Absorption ◽  
Free Jets

Supersonic jet spectrometry of chemical species resulting from thermal decomposition of polystyrene and polycarbonate

1992 ◽  
Vol 64 (19) ◽  
pp. 931A-940A ◽  
Author(s):  
Totaro Imasaka ◽  
Masami Hozumi ◽  
Nobuhiko Ishibashi
Keyword(s):  
Thermal Decomposition ◽  
Supersonic Jet ◽  
Chemical Species
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