The visible band systems of SnH+ and SnD+

1986 ◽  
Vol 64 (6) ◽  
pp. 700-706 ◽  
Author(s):  
Sumio Yamaguchi ◽  
Hiroshi Obase ◽  
Masaharu Tsuji ◽  
Yukio Nishimura
Keyword(s):  
Emission Spectra ◽  
Previous Measurement ◽  
Visible Emission ◽  
Spectroscopic Constants ◽  
Visible Band ◽  
First Time

Visible emission spectra of SnH+ and SnD+ produced from the helium afterglow reactions of SnH4 and SnD4, respectively, have been recorded under higher resolution than the previous measurement. In addition to the three bands reported previously, three new bands of [Formula: see text] have been identified, while eleven bands of [Formula: see text] have been observed for the first time. Spectroscopic constants of the [Formula: see text] and X1Σ+ states have been improved for SnH+ and determined for SnD+.

The a3Π1–X1Σ+ emission system of CBr+

1983 ◽  
Vol 61 (2) ◽  
pp. 251-255 ◽  
Author(s):  
Masaharu Tsuji ◽  
Keiji Shinohara ◽  
Toshinori Mizuguchi ◽  
Yukio Nishimura
Keyword(s):  
Charge Transfer ◽  
Emission Spectrum ◽  
Thermal Energy ◽  
Transfer Reaction ◽  
Vibrational Analysis ◽  
Visible Emission ◽  
Spectroscopic Constants ◽  
Charge Transfer Reaction ◽  
Emission System ◽  
First Time

The visible emission spectrum of the CBr+ molecule has been observed for the first time in the helium afterglow reaction of CBr4. It was excited by the dissociative charge-transfer reaction of He+ with CBr4 at thermal energy. The vibrational analysis led to the following spectroscopic constants (in cm−1).[Formula: see text]

The visible band systems of GeH+ and GeD+ in the helium afterglow

1986 ◽  
Vol 64 (10) ◽  
pp. 1374-1378 ◽  
Author(s):  
Sumio Yamaguchi ◽  
Masaharu Tsuji ◽  
Yukio Nishimura
Keyword(s):  
Electronic Transition ◽  
Transition Moment ◽  
Spectroscopic Constants ◽  
Electronic Transition Moment ◽  
Visible Band ◽  
Condon Factors ◽  
First Time ◽  
Franck Condon ◽  
Morse Potentials ◽  
Higher Sensitivity

The [Formula: see text] intercombination bands of GeH+ and GeD+ have been observed from the helium afterglow reactions of GeH4 and GeD4, respectively. Only the (0,0) band of [Formula: see text] had been rotationally analyzed before; the higher sensitivity of the new measurements made possible the rotational analyses of four weaker bands. Eleven bands of [Formula: see text] were observed for the first time, and rotational analyses were made of five dominant bands. By using isotope relationships, we obtained detailed spectroscopic constants for the [Formula: see text] and X1Σ+ states of GeH+ and GeD+. Franck–Condon factors and r centroids of the [Formula: see text] transitions of GeH+ and GeD+ have been calculated on the basis of Morse potentials. The dependence of the electronic transition moment on the r centroid and the relative vibrational populations of [Formula: see text] and [Formula: see text] have been estimated.

ELECTRON STRUCTURE INVESTIGATIONS OF InGaP/GaAs(100) HETEROSTRUCTURES WITH InP QUANTUM DOTS

2007 ◽  
Vol 06 (03n04) ◽  
pp. 215-219
Author(s):  
E. P. DOMASHEVSKAYA ◽  
V. A. TEREKHOV ◽  
V. M. KASHKAROV ◽  
S. YU. TURISHCHEV ◽  
S. L. MOLODTSOV ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Emission Spectra ◽  
Luminescence Spectra ◽  
Partial Density ◽  
Edge Structure ◽  
X Ray ◽  
Metal Organic ◽  
Structure Investigations ◽  
First Time ◽  
Inp Quantum Dots

Ultrasoft X-ray emission spectra (USXES) and X-ray absorption near-edge structure (XANES) spectra with the use of synchrotron radiation in the range of P L2,3-edges were obtained for the first time for nanostructures with InP quantum dots grown on GaAs 〈100〉 substrates by vapor-phase epitaxy from metal–organic compounds. These spectra represent local partial density of states in the valence and conduction bands. The additional XANES peak is detected; its intensity depends on the number of monolayers forming quantum dots. Assumptions are made on the band-to-band origin of luminescence spectra in the studied nanostructures.

Quantum-Confined Optical Interband Transitions in 5-Doped Doping Superlattices

1989 ◽  
Vol 145 ◽  
Author(s):  
E. F. Schubert ◽  
T. D. Harris ◽  
J. E. Cunningham
Keyword(s):  
Emission Spectra ◽  
Doping Profile ◽  
Luminescence Spectra ◽  
Interband Transitions ◽  
Doping Technique ◽  
Quantum Confined ◽  
P Type ◽  
First Time ◽  
Experimental Absorption ◽  
Good Agreement

AbstractOptical absorption and photoluminescence experiments are performed on GaAs doping superlattices, which have a δ-function-like doping profile of alternating n-type and p-type dopant sheets. Absorption and emission spectra reveal for the first time the clear signature of quantum-confined interband transitions. The peaks of the experimental absorption and luminescence spectra are assigned to calculated energies of quantum-confined transitions with very good agreement. It is shown that the employment of the δ-doping technique results in improved optical properties of doping superlattices.

MOLTEN SALT SYNTHESIS OF YF3:Yb3+/Ln3+(Ln = Er3+, Tm3+) MICROSHEETS WITH MULTICOLOR UPCONVERSION LUMINESCENCE

2013 ◽  
Vol 06 (06) ◽  
pp. 1350061 ◽  
Author(s):  
MINGYE DING ◽  
CHUNHUA LU ◽  
LINHAI CAO ◽  
YARU NI ◽  
ZHONGZI XU
Keyword(s):  
Molten Salt ◽  
Laser Diode ◽  
Upconversion Luminescence ◽  
Emission Spectra ◽  
Upconversion Emission ◽  
Molten Salt Synthesis ◽  
Molten Salt Method ◽  
Orthorhombic System ◽  
Co Doping ◽  
First Time

In this paper, highly crystalline YF 3: Yb 3+/ Ln 3+( Ln = Er 3+, Tm 3+) microsheets were successfully synthesized by a surfactant-free molten salt method for the first time. The results indicated that the as-obtained samples belonged to orthorhombic system and exhibited microsheets morphology with side lengths of 30 to 80 μm and wall thickness from 1 to 1.5 μm. By changing the dopant's species ( Ln 3+), multicolor (yellow and blue) upconversion emission can be observed in YF 3: Yb 3+/ Ln 3+ microsheets under 980 nm laser diode (LD) excitation. The upconversion mechanisms in co-doping YF 3 samples were analyzed in detail based on the emission spectra. Importantly, this approach not only proposes a new alternative in synthesizing such materials, but also opens the possibility to meet the increasing commercial demand.

scholarly journals Fedorite from Murun Alkaline Complex (Russia): Spectroscopy and Crystal Chemical Features

Minerals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 702
Author(s):  
Ekaterina V. Kaneva ◽  
Roman Yu. Shendrik ◽  
Tatiana A. Radomskaya ◽  
Ludmila F. Suvorova
Keyword(s):  
Crystal Structure ◽  
Emission Spectra ◽  
Chemical Study ◽  
Double Layers ◽  
Water Molecules ◽  
Crystal Chemical ◽  
Alkaline Complex ◽  
Deformation Parameters ◽  
First Time ◽  
Red Coloration

Fedorite is a rare phyllosilicate, having a crystal structure characterized by SiO4-tetrahedral double layers located between continuous layers formed by edge-sharing (Ca,Na)-octahedra, and containing interlayer K, Na atoms and H2O molecules. A mineralogical-petrographic and detailed crystal-chemical study of fedorite specimens from three districts of the Murun alkaline complex was performed. The sequence of the crystallization of minerals in association with fedorite was established. The studied fedorite samples differ in the content of interlayer potassium and water molecules. A comparative analysis based on polyhedral characteristics and deformation parameters was carried out. For the first time, EPR, optical absorption and emission spectra were obtained for fedorite. The raspberry-red coloration of the mineral specimens could be attributed to the presence of Mn4+ ions.

scholarly journals Burst-induced coronal cooling in GS 1826–24

2020 ◽  
Vol 634 ◽  
pp. A58 ◽  
Author(s):  
C. Sánchez-Fernández ◽  
J. J. E. Kajava ◽  
J. Poutanen ◽  
E. Kuulkers ◽  
V. F. Suleimanov
Keyword(s):  
Neutron Star ◽  
Emission Spectra ◽  
Spectral Shape ◽  
Type I ◽  
Simultaneous Observation ◽  
X Ray ◽  
Neutron Star Mass ◽  
Hard State ◽  
First Time ◽  
Burst Emission

Type I X-ray bursts in GS 1826–24, and in several other systems, may induce cooling of the hot inner accretion flow that surrounds the bursting neutron star. Given that GS 1826–24 remained persistently in the hard state over the period 2003–2008 and presented regular bursting properties, we stacked the spectra of the X-ray bursts detected by INTEGRAL (JEM-X and ISGRI) and XMM-Newton (RGS) during that period to study the effect of the burst photons on the properties of the Comptonizing medium. The extended energy range provided by these instruments allows the simultaneous observation of the burst and persistent emission spectra. We detect an overall change in the shape of the persistent emission spectrum in response to the burst photon shower. For the first time, we observe simultaneously a drop in the hard X-ray emission, together with a soft X-ray excess with respect to the burst blackbody emission. The hard X-ray drop can be explained by burst-induced coronal cooling, while the bulk of the soft X-ray excess can be described by fitting the burst emission with an atmosphere model, instead of a simple blackbody model. Traditionally, the persistent emission was assumed to be invariant during X-ray bursts, and more recently to change only in normalization but not in spectral shape; the observed change in the persistent emission level during X-ray bursts may thus trigger the revision of existing neutron star mass-radius constraints, as the derived values rely on the assumption that the persistent emission does not change during X-ray bursts. The traditional burst fitting technique leads to up to a 10% overestimation of the bolometric burst flux in GS 1826–24, which significantly hampers the comparisons of the KEPLER and MESA model against this “textbook burster”.

Photochemistry Channels of Merocyanine Encapsulated in Sol-Gel Glasses

1994 ◽  
Vol 346 ◽  
Author(s):  
A. M. Mahloudji ◽  
L. B. Meuret ◽  
C. T. Lin
Keyword(s):  
Molecular Form ◽  
Photophysical Properties ◽  
Sol Gel ◽  
Emission Spectra ◽  
Transfer Characteristic ◽  
Optically Transparent ◽  
Quinoid Form ◽  
Gel Glasses ◽  
Processing Techniques ◽  
First Time

ABSTRACTPhotophysical properties of l-Docosyl-4-(4-hydroxystyryl)pyridiniurn bromide (SB), a merocyanine dye in solution and encapsulated in sol-gel derived glass are investigated at 298 and 77 K. In solution, the absorption spectra of SB display an equilibrium between the quinolinium and benzoid forms. The equilibrium can be shifted to either quinolinium or benzoid form under an acidic or basic condition, respectively. The emission spectra of SB, on the other hand, give not only the quinolinium and benzoid forms but also the quinoid form which emits at 500 nm. The existence of excited state quinoid form of SB is also evident in the excitation spectrum while the emission at 500 nm is monitored. Both in solution and in xerogel, the quinoid form of SB is shown to be photochemically unstable as compared to the benzoid form. It is proposed that the photoexcited quinolinium form of SB is a proton dissociative species which transforms readily to become the quinoid form. The results indicate that photochemistry channels of SB are originated from the quinoid form. Moreover, the benzoid form of SB (photochemically stable) exhibits large hyperpolarizability due to its charge-transfer characteristic, and is a desired molecular form for nonlinear optical (NLO) applications. The material processing techniques for stabilizing the benzoid form of SB in optically transparent sol-gel glasses are illustrated for the first time.

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