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Spectrum of the hydroxyl radicalCarlone, Cosmo January 1969 (has links)
The B²Σ⁺→A²Σ⁺ and C²Σ⁺→A²Σ⁺ systems of OH and OD were photographed at high resolution. The apparent dissociation energy D°(A²Σ⁺) is calculated to be (18847 ± 15) cm⁻¹ for OH and (19263 ± 15) cm⁻¹ for OD. An upper limit to D°(X²π₃/₂) OH is deduced to be (35420 ± 15) cm⁻¹. Evidence for a dispersion hump in the B(²Σ⁺) state which is about 100 cm⁻¹ larger than the hump in the A(²Σ⁺) state is presented.
The broadening of the rotational lines in several bands of both systems has established a strong predissociation of the A(²Σ⁺) state near v = 5 in OH. The lifetime of these predissociated levels is ≈10⁻¹¹ seconds. A definite identification of the predissociating state has not been possible.
Newly discovered vibrational levels in the C(²Σ⁺) state have led to the following constants, in cm⁻¹, of the
OH radical in the C²Σ⁺ state
Te = 89500
Be = 4.247
D° = 29418 ± 15
∝e = 0.078
ωe = 1232.9
Ɣ(v=O) = 1.09
Ωeχe = 19.1
Ɣ(v=1) = 0.88
Rotational constants and spin splitting constants in the A(²Σ⁺) and B(²Σ⁺) states, more accurate than previously available are presented. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
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Photochemistry of small moleculesNiederjohann, Britta. January 2004 (has links) (PDF)
Bielefeld, University, Diss., 2004.
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An ab initio calculation of the potential energy curves of some excited electronic states of OHEasson, Ian Whiteman January 1971 (has links)
A series of ab initio calculations has been performed in the Born-Oppenheimer approximation for some electronic states of OH. Wavefunctions and energies are calculated variationally. The form chosen for the wave-function is a finite linear superposition of configurations. Molecular orbitals are formed by Schmidt-orthogonalizing the atomic orbitals, each of which is represented by a single Slater-type orbital. The variational parameters are the coefficients in the linear expansion of the wave-function, and the non-linear parameters [character omitted] of the Slater-type orbitals.
Wavefunctions and potential energy curves are given for some of the lower-lying ²Σˉ and ²Σˉ and ²Πstates.
One result of note is that the lowest ²Σˉ state is bound. This disagrees with an earlier calculation (Harris and Michels, 1969), but it is in accord with a recent interpretation of the spectrum (Pryce, 1971). / Science, Faculty of / Physics and Astronomy, Department of / Graduate
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Extragalactic hydroxylKlöckner, Hans-Rainer. January 2004 (has links)
Thesis (Doctoral)--Rijksuniversiteit Groningen, 2004. / Includes bibliographical references (p. [145]-151).
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The copper-catalyzed oxidation of biologically relevant thiolsSilvester, Stephen January 1999 (has links)
No description available.
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Fluorescent derivatising reagents for hydroxyl groupsBayliss, M. A. J. January 1988 (has links)
No description available.
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Verhalten von Isothiocyanaten unter simulierten troposphärischen Bedingungen unter besonderer Berücksichtigung der HydroxylradikaleSommerlade, Ronald. Unknown Date (has links) (PDF)
München, Techn. Universiẗat, Diss., 2006.
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The substituent group distribution in a Michael reaction: carbamoethyl cellulose.Touzinsky, Gerald F. (Gerald Francis) 01 January 1964 (has links)
No description available.
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Computational investigations of hydroxyl radical addition to aromatics and alkenes in the presence of solvent, conformational preferences of dendrimers, and theoretical studies of arabinofuranosides and septanosidesDeMatteo, Matthew P., January 2007 (has links)
Thesis (Ph. D.)--Ohio State University, 2007. / Title from first page of PDF file. Includes bibliographical references (p. 338-365).
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Study of photolytic interference on HO measurements by LIF-FAGEMartinez, Carmen Ivette 01 January 1989 (has links)
For many years there has been a great interest among the scientific community in the study of the hydroxyl radical, HO. This interest stems from the fundamental role played by this molecule in the photochemistry of the atmosphere, mainly as a cleansing agent of environmental pollutants. Knowing the concentration of the radical would enable scientists to corroborate current atmospheric models and to predict future trends in the atmosphere. Even though there is a great interest in the determination of atmospheric concentrations of this molecule, the task has been very difficult. This is mainly due to the lack of a method sensitive enough to detect concentrations around 106 molecules per cubic centimeter. The most accurate method presently available is the method of laser induced fluorescence using the fluorescence assay with gas expansion technique (LIF-FAGE). This method involves low pressure excitation of HO from its ground state to its lowest electronic excited state and observing the consequent fluorescence around 309 nm. The procedure is done at a pressure of 5 Torr to maximize the fluorescence lifetime of the radical and to minimize the interference of photolytic species. Background determination is achieved by chemical modulation using isobutane in a second channel of the same cell which removes the HO signal.
In this study an assessment of the level of ozone interference in LIFF AGE has been done by calculating the relative population distribution of HO among its rotational levels and from this, determining its temperature. When the laser passes through the excitation detection cell it photolyses the ozone present producing in this way the highly reactive 0 1(D). When this molecule reacts with water or with isobutane it produces HO, and this is the source of interference in the actual measurements.
In the determination of the relative population distributions of the different HO species, it was found that the naturally occurring HO has a thermal distribution with a temperature of about 300 K. The HO molecules produced from the reaction of 0 1(D) with isobutane also showed a thermal distribution with a temperature of about 230 K. On the other hand, the HO produced from the reaction of 0 1(D) with water did not show a thermal distribution. Two distinct temperatures were observed for this case: one around 200 K for values of K = 1 to 4, and the second one around 3000 K for values of K = 5 to 6. These values agree with previous experimental results for LIF methods by other authors except for the fact that the deviation from the first temperature determined by other authors starts at K = 6 or 7.
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