Analysis of absorption spectra of purple bacterial reaction centers in the near infrared region by higher order derivative spectroscopy

2006 ◽  
Vol 122 (1) ◽  
pp. 16-26 ◽  
Author(s):  
I.K. Mikhailyuk ◽  
P.P. Knox ◽  
V.Z. Paschenko ◽  
A.P. Razjivin ◽  
H. Lokstein
Keyword(s):  
Absorption Spectra ◽  
Near Infrared ◽  
Infrared Region ◽  
Higher Order ◽  
Reaction Centers ◽  
Order Derivative ◽  
Bacterial Reaction Centers ◽  
Derivative Spectroscopy ◽  
Higher Order Derivative ◽  
Near Infrared Region

Quantitative analysis of hemoglobin oxygenation state of rat brain in situ by near-infrared spectrophotometry

1988 ◽  
Vol 64 (2) ◽  
pp. 796-802 ◽  
Author(s):  
O. Hazeki ◽  
M. Tamura
Keyword(s):  
Absorption Spectra ◽  
Near Infrared ◽  
Infrared Region ◽  
Hemoglobin Content ◽  
Hemoglobin Oxygenation ◽  
Absorbance Changes ◽  
Near Infrared Region ◽  
The Difference ◽  
Difference Absorption ◽  
The Brain

The light in the near-infrared region (700–900 nm) was illuminated on the rat head, and absorption spectra were measured with the transmitted light under various conditions. The absorbance changes less than 780 nm were attributable to hemoglobin in the brain tissue, whereas those greater than 780 nm were associated with both hemoglobin and cytochrome oxidase. The changes of oxy- and total (oxy- plus deoxy-) hemoglobin content in the rat head could be monitored quantitatively by expressions of delta A700--1.20 delta A730 and delta A700--1.52 delta A730, respectively. The oxyhemoglobin content in the tissue was decreased as the O2 tension in inspired gas was lowered. At 10% O2 approximately 50% of hemoglobin was deoxygenated. The total hemoglobin content was increased under anoxic conditions. Inhalation of 5% CO2 and intravenous injection of a Ca2+ blocker nicardipine increased the O2 saturation of hemoglobin in the brain. These conclusions were confirmed by measuring the difference absorption spectra in the near-infrared region.

The absorption spectra of H2O+and D2O+in the visible and near infrared region

2004 ◽  
Vol 102 (6) ◽  
pp. 611-621 ◽  
Author(s):  
Yujie Gan ◽  
Xiaohua Yang ◽  
Yingchun Guo ◽  
Shenghai Wu ◽  
Wei Li ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Near Infrared ◽  
Infrared Region ◽  
Near Infrared Region

Near infrared spectra of some cobalt(II) compounds

1968 ◽  
Vol 21 (7) ◽  
pp. 1775
Author(s):  
DP Graddon ◽  
GM Mockler
Keyword(s):  
Absorption Band ◽  
Absorption Spectra ◽  
Metal Atom ◽  
Infrared Spectra ◽  
Near Infrared ◽  
Infrared Region ◽  
Absorption Bands ◽  
Heterocyclic Base ◽  
Near Infrared Spectra ◽  
Near Infrared Region

Absorption spectra of compounds CoX2B2 and CoX2B4 (X = Cl, Br, I, or NCS; B = a heterocyclic base) have been obtained by reflectance and in solution in the near infrared region between 1000 and 2000 mμ. The spectra are characteristic of the stereochemistry of the metal atom: octahedral compounds have a single absorption band near 1100 mμ, e < 10; tetrahedral compounds have three overlapping absorption bands near 1100,1400, and 1700 mp, 30 < < 150. Comparisons are made with previously observed spectra of octahedral and tetrahedral species of the types CoL2+6 and CoX2-4.

Harmonic and Anharmonic Oscillator Models for Pure Vibrational Infrared Spectroscopy of Diatomic Molecules

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Rohit Singh
Keyword(s):  
Infrared Spectroscopy ◽  
Harmonic Oscillator ◽  
Absorption Spectra ◽  
Near Infrared ◽  
Anharmonic Oscillator ◽  
Diatomic Molecules ◽  
Infrared Region ◽  
Molecular Vibration ◽  
Absorption Bands ◽  
Near Infrared Region

In molecular vibrational infrared spectroscopy, absorption spectra arise from molecular vibration and correspond to transitions between the vibrational energy levels associated with a given electronic state of the molecule. The vibrational transitions, which fall in the near infrared region, are induced through the interaction of the molecular electric dipole with the electric vector of the electromagnetic radiation. The near infrared region extends roughly from 1?m to ?10?^2 ?m. The article explains the pure vibrational absorption spectra of diatomic molecules such as HCl, HBr, HI, CO, … etc. In order to explain the vibrational spectra, diatomic molecules are treated as harmonic oscillator and anharmonic oscillator. In the harmonic oscillator model, we get only one absorption band at the wavenumber value? ?_osc corresponding to frequency of oscillation?_osc while in the actual experimental data, there are many absorption bands corresponding to wave numbers slightly lesser than ? ?_osc, 2? ?_osc, 3? ?_osc, ……..The occurrence of these additional bandsis attributed to the selection rule ?v=±2, ±3, ±4, ……The additional bands are having lesser intensity and are called overtone bands.

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