Optical Characterization Of GaAs/Si: Spectral Features in the Excitonic Region

1987 ◽  
Vol 91 ◽  
Author(s):  
S. Zemon ◽  
S. K. Shastry ◽  
C. Jagannath ◽  
P. Norris ◽  
G. Lambert
Keyword(s):  
Excited State ◽  
Ground State ◽  
State Transition ◽  
Optical Characterization ◽  
Spectral Width ◽  
Light Hole ◽  
Spectral Features ◽  
Ground State Transition ◽  
First Time

ABSTRACTUsing 4.2 K selective photoluminescence (PL) excitation and PL excitation spectroscopy, the n = 2 excited state of the light-hole exciton is observed for the first time in GaAs/Si. The excited state is about 3 meV above the ground state, similar to exciton results for GaAs/GaAs. A spectral width of 1.8 meV is observed for the ground state transition, the narrowest yet reported.

LIFETIME MEASUREMENTS OF STATES IN O18 AND Ne22

1964 ◽  
Vol 42 (6) ◽  
pp. 1311-1323 ◽  
Author(s):  
M. A. Eswaran ◽  
C. Broude
Keyword(s):  
Excited State ◽  
Ground State ◽  
Doppler Shift ◽  
State Transition ◽  
Branching Ratios ◽  
Ground State Transition ◽  
Lifetime Measurements ◽  
Doppler Shift Attenuation ◽  
First Excited State ◽  
Doppler Shift Attenuation Method

Lifetime measurements have been made by the Doppler-shift attenuation method for the 1.98-, 3.63-, 3.92-, and 4.45-Mev states in O18 and the 1.28-, 3.34-, and 4.47-Mev states in Ne22, excited by the reactions Li7(C12, pγ)O18 and Li7(O16, pγ)Ne22. Branching ratios have also been measured. The results are tabulated.[Formula: see text]The decay of the 3.92-Mev state in O18 is 93.5% to the 1.98-Mev state and 6.5% to the ground state and of the 4.45-Mev state 74% to the 3.63-Mev state, 26% to the 1.98-Mev state, and less than 2% to the ground state. In Ne22, the ground-state transition from the 4.47-Mev state is less than 2% of the decay to the first excited state.

THE NEUTRON CAPTURE 7-RAYS FROM POTASSIUM

1953 ◽  
Vol 31 (6) ◽  
pp. 927-931 ◽  
Author(s):  
G. A. Bartholomew ◽  
B. B. Kinsey
Keyword(s):  
Excited State ◽  
Potassium Carbonate ◽  
Ground State ◽  
Neutron Capture ◽  
State Transition ◽  
Ground State Transition ◽  
Γ Rays ◽  
Γ Ray

The capture γ-rays from potassium have been re-examined with greater resolution than was used in previous experiments. The upper end of the spectrum has been carefully studied both with a sample of natural potassium carbonate and with another in which the potassium was enriched in K40. From a comparison of the spectra two γ-rays with energies of 9.39 ± 0.06 and 8.45 ± 0.02 Mev. are assigned to capture by that isotope. The strong γ-ray at 7.757 ± 0.008 Mev. previously ascribed to the ground state transition in K40 is now found to represent a transition to a low-lying excited state in that nucleus.

scholarly journals The Submillimetre Wavelength Spectrum of Orion A

1987 ◽  
Vol 115 ◽  
pp. 153-154
Author(s):  
Glenn J. White ◽  
Tania Monteiro ◽  
Ruth Rainey ◽  
Kevin Richardson ◽  
Matthew Griffin ◽  
...  
Keyword(s):  
Ground State ◽  
State Transition ◽  
Spatial Structures ◽  
Ground State Transition ◽  
Frequency Range ◽  
Queen Mary College ◽  
Heterodyne Receiver ◽  
Upper Limits ◽  
First Time ◽  
Spectral Scan

We report on the first submillimetre wavelength spectral scan of the Orion A molecular cloud in the frequency range 342-463 GHz (0.88-0.65 mm) using the Queen Mary College Submillimetre Heterodyne Receiver at UKIRT. Twenty-eight molecular transitions were detected, the majority of these for the first time. The lines include transitions of CO, CS, HCN, HCO+, H2CO, H2CS, SO, SO2, CCH, SiO and CH3OH. Upper limits are reported for a number of lines including CO+ and the ground state transition of NH2. A number of the lines are surprisingly intense, and we will present maps of the relative distributions of HCO+, HCN, H2CO and CCH, which show striking differences in their spatial structures. We will present details of the excitation of a number of the lines based on the results from this survey.

THE 6.48-MEV LEVEL OF C11

1963 ◽  
Vol 41 (5) ◽  
pp. 784-792 ◽  
Author(s):  
D. W. Braben ◽  
P. J. Riley ◽  
G. C. Neilson
Keyword(s):  
Excited State ◽  
Ground State ◽  
State Transition ◽  
Time Of Flight ◽  
Coupling Model ◽  
Ground State Transition ◽  
Intermediate Coupling ◽  
Intermediate Coupling Model

The 6.48-Mev level of C11 has been studied by means of the B10(d,nγ)C11 reaction using time-of-flight techniques. The results show that the ratio of the ground-state transition to the cascade via the second excited state of C11 is 8 ± 1:1. Comparison is made with the predictions of the intermediate-coupling model.

PROPERTIES OF LEVELS AT 6.69 AND 6.88–6.89 MeV IN 28Si

1966 ◽  
Vol 44 (5) ◽  
pp. 1087-1097 ◽  
Author(s):  
R. J. A. Levesque ◽  
R. W. Ollerhead ◽  
E. W. Blackmore ◽  
J. A. Kuehner
Keyword(s):  
Excited State ◽  
Alpha Particle ◽  
Ground State ◽  
State Transition ◽  
Gamma Ray ◽  
The Other ◽  
Ground State Transition ◽  
Angular Correlations ◽  
First Excited State ◽  
Strong Ground

Levels at 6.69, 6.88, and 6.89 MeV were observed in the 16O(16O, α)28Si reaction, and angular correlations were measured for the resulting gamma-ray transitions, using the geometry in which the alpha particle is detected at 0°. The level at 6.69 MeV had not been reported previously and was assigned spin and parity 0+. The doublet of levels at 6.88–6.89 MeV was not resolved in these measurements, but angular correlations of the gamma-ray transitions were possible, using spectrum subtraction techniques. One member of the doublet, previously assigned spin 3, has a strong ground-state transition; the angular correlation for this transition confirms a 3− assignment to this level. The other member of the doublet, which decays almost entirely to the first excited state, could not be assigned a spin on the basis of these measurements. However, taken in conjunction with other measurements, an assignment of 4+ is favored.

Substitution Effect on 2-(Oxazolinyl)-phenols: Emission Color-Tunable, Minimalistic Excited-State Intramolecular Proton Transfer (ESIPT)-based Luminophores

2021 ◽  
Author(s):  
Dominik Göbel ◽  
Pascal Rusch ◽  
Daniel Duvinage ◽  
Tim Stauch ◽  
Nadja C. Bigall ◽  
...  
Keyword(s):  
Optical Properties ◽  
Excited State ◽  
Solid State ◽  
Substitution Effect ◽  
Optical Characterization ◽  
Intramolecular Proton Transfer ◽  
Substitution Pattern ◽  
Emission Color ◽  
Color Tunable

The synthesis and optical characterization of novel single-benzene ESIPT-based fluorophores is described in solid state and in solution. Special attention is given towards the influence of their unique substitution pattern on their optical properties. Depending on this pattern, aggregation induced emission or aggregation caused quenching (ACQ) is observed in the solid state.<br>

scholarly journals Laser spectroscopy of the 1001-nm ground-state transition in dysprosium

2018 ◽  
Vol 98 (4) ◽  
Author(s):  
D. Studer ◽  
L. Maske ◽  
P. Windpassinger ◽  
K. Wendt
Keyword(s):  
Laser Spectroscopy ◽  
Ground State ◽  
State Transition ◽  
Ground State Transition

Femtosecond Optical Characterization of the Excited State of Rhodobacter Capsulatus DLL

1992 ◽  
pp. 237-243
Author(s):  
Marten H. Vos ◽  
Fabrice Rappaport ◽  
Jean-Christophe Lambry ◽  
Jacques Breton ◽  
Jean-Louis Martin
Keyword(s):  
Excited State ◽  
Rhodobacter Capsulatus ◽  
Optical Characterization

scholarly journals Measurement of the 2+→0+ ground-state transition in the β decay of F20

2019 ◽  
Vol 100 (6) ◽  
Author(s):  
O. S. Kirsebom ◽  
M. Hukkanen ◽  
A. Kankainen ◽  
W. H. Trzaska ◽  
D. F. Strömberg ◽  
...  
Keyword(s):  
Ground State ◽  
State Transition ◽  
Ground State Transition ◽  
Β Decay

scholarly journals Multipolarity of the2−→1−, ground-state transition inBi210via multivariable angular correlation analysis

2016 ◽  
Vol 94 (1) ◽  
Author(s):  
N. Cieplicka-Oryńczak ◽  
B. Szpak ◽  
S. Leoni ◽  
B. Fornal ◽  
D. Bazzacco ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Angular Correlation ◽  
Ground State ◽  
State Transition ◽  
Ground State Transition
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