Nonradiative Rydberg .tautm. valence relaxation of nitric oxide trapped in argon, krypton, and xenon matrixes

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GaInAsN quantum dots (QDs) were grown in inverted pyramids on a patterned (111) B GaAs surface. Incorporation of N in the active structure is attested to by a significant (similar to 80 meV) redshift of the photoluminescence spectrum of the QDs. Influence of the capillarity effect on the N incorporation is evidenced by comparing the redshift in the QD emission to that of its quantum wire (QWR) barriers. The significant increase in the inhomogeneous broadening of the InGaAsN QD arrays as compared to similar

Combinatorial high-vacuum chemical vapor deposition (HV-CVD) was used to identify the conditions required to obtain hafnium-doped lithium niobate thin films on sapphire {001} substrates. Niobium tetraethoxydimethylaminoethoxide (Nb(OEt)(4)(dmae)), lithium tert-butoxide (Li(OBut)), and hafnium tert-butoxide (Hf(OBut)(4)) were used as precursors. X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicated that a single phase of textured {001} Hf-doped lithium niobate film was obtained under c

The recognition and sensing of aqueous chloride by synthetic receptors is a challenging task. Herein we apply the chemosensing ensemble methodology to optically detect chloride in water at near physiological pH. Variants based on two closely related receptors have been explored. The sensors can be obtained in situ by mixing a rhodium complex, a bidentate N,N-chelate ligand, and a fluorescent dye in buffered aqueous solution. Upon mixing the sensor components, the rhodium complex binds to the N,N-chelate lig

In solids spinning at the magic angle, the indirect detection of single-quantum (SQ) and double-quantum (DQ) N-14 spectra (l = 1) via spy nuclei S = 1/2 such as protons can be achieved in the manner of heteronuclear single- or multiple-quantum correlation (HSQC or HMQC) spectroscopy. The HMQC method relies on the excitation of two-spin coherences of the type T-11(l) T-11(S) and T-21(l) T-11(S) at the beginning of the evolution interval t(1). The spectra obtained by Fourier transformation from t(1) to omega(

We calculate defect levels of dangling bonds in germanium using hybrid density functionals. To validate our approach, we first consider the dangling bond in silicon finding two well-separated defect levels, in excellent correspondence with their experimental location. Application of our scheme to the dangling bond in germanium then yields two very close defect levels lying just above the valence band, consistent with the location of the experimentally determined charge neutrality level. The small correlatio

Optical spectroscopy of the emission from a plasma created during electrical discharge machining (EDM) showed a strong Ha line coming from neutral hydrogen atoms and continuum radiation. An electron temperature of 0.7 eV and plasma density of 2.1018 cm(3) had been calculated. New spatially-resolved as well as temporal optical emission spectroscopy of the EDM plasmas showed that this density is slightly higher in the plasma center and decrease rapidly with time. The electron temperature remains roughly const

claim (i) that our estimate is only based on the analysis of Raman spectra which are notoriously difficult to calculate, (ii) that we inappropriately obtained the value of f 0:75 on the basis of the Raman spectrum of a model structure with f 0:09, and (iii) that 11 B NMR spectra are insensitive to f. We here show that these claims are unsubstantiated. The accuracy of Raman intensities and frequencies as obtained within density functional schemes has amply been demonstrated for a variety of systems including

This thesis reports on results of three different experiments of photo-induced structural dynamics in the condensed phase, investigated by time-resolved pump-probe spectroscopy with femtosecond time-resolution. In the first part, we address the ultrafast dynamics of a quantum solid : crystalline hydrogen. This is accomplished by optical excitation of a dopant molecule, Nitric Oxide (NO), to a large orbital Rydberg state, which leads to a bubble-like expansion of the species surrounding the impurity. The dyn

We propose a new scheme to systematically design optimized connection atoms for arbitrary quantum mechanics/mol. mechanics (QM/MM) boundaries: the pseudopotential of the boundary atom is optimized such that it minimizes the errors in the electronic structure due to the truncation of the QM region. In plane wave based electronic structure calcns. the interactions between core and valence electrons are usually represented by effective core potentials. These pseudopotentials are usually constructed such that t

We present detailed analysis of inter- and intraband transitions in GaN/AlN self-organized quantum dots grown on sapphire, silicon (111) and 6H-SiC substrates. Samples containing quantum dots of different size were characterized by means of transmission electron microscopy, photoluminescence and photoinduced absorption spectroscopy. Interlevel transitions in the conduction band were identified in the 0.52-0.98 eV range covering the telecommunication wavelength band. The s-p(z), transition ranges from 0.52 e

We have employed femtosecond laser writing in order to induce refractive-index changes and waveguides in Ti3+-doped sapphire. Doping the sapphire crystal with an appropriate ion significantly reduces the threshold for creating structural changes, thus enabling the writing of waveguide structures. Passive and active buried channel waveguiding is demonstrated and images of the guided modes, propagation-loss values, fluorescence spectra, and output efficiencies are presented. The guiding area is located around

We have optimized laser ablation thin film deposition and transfer procedures within synchrotron vault, specifically to perform angle-integrated and angle-resolved photoemission spectroscopy (ARPES) on high-T-c and related films without cleaving the samples. However, the chain-containing phases like YBCO-123 easily loose surface oxygen and do not exhibit stable Fermi edge, hence are not suitable for ARPES studies. Direct in situ ARPES studies on strained LSCO-214 films show striking strain effects on the el

Nonradiative Rydberg .tautm. valence relaxation of nitric oxide trapped in argon, krypton, and xenon matrixes

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Dilute-nitride GaInAsN/GaAs site-controlled pyramidal quantum dots

Combinatorial High-Vacuum Chemical Vapor Deposition of Textured Hafnium-Doped Lithium Niobate Thin Films on Sapphire

Turn-Off-and-On: Chemosensing Ensembles for Sensing Chloride in Water by Fluorescence Spectroscopy

Line-narrowing in proton-detected nitrogen-14 NMR

Charge transition levels of the Ge dangling bond defect at Ge/insulator interfaces

Time-resolved imaging and spatially-resolved spectroscopy of Electrical Discharge Machining Plasmas

Comment on "fraction of boroxol rings in vitreous boron oxide from a first-principles analysis of Raman and NMR spectra" - Umari and Pasquarello reply

Ultrafast structural dynamics in electronically excited many-body systems

QM/MM boundary atoms by variational optimization of analytic pseudopotentials

Spectroscopy of the electron states in self-organized GaN/AlN quantum dots

Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+: Sapphire

Direct photoemission spectroscopy and electronic properties of in situ grown, strained high-T-c and related oxide films