Visible Luminescence of Eu3+ Ions in Lithium Barium Borate Glass

2016 ◽  
Vol 702 ◽  
pp. 66-70
Author(s):  
Keerati Kirdsiri ◽  
Benchaphorn Damdee ◽  
Jakrapong Kaewkhao
Keyword(s):  
Excited States ◽  
Ground State ◽  
Room Temperature ◽  
State Level ◽  
Barium Borate ◽  
Absorption Bands ◽  
Visible Luminescence ◽  
Barium Borate Glass ◽  
Quench Method ◽  
Ground State Level

Europium doped lithium barium borate glasses were fabricated by conventional melt-quench method and were analyzed their physical, optical and luminescence properties through absorption, excitation, emission and decay analysis at room temperature. The experimental data revealed that the five discrete absorption bands peaking at 393, 464, 532, 2032 and 2212 nm due to the transitions from 7F0 ground state level to various excited states of Eu3+ ions. The luminescence of Eu3+ in visible bands were observed under 394 nm pumping.

ABSORPTION SPECTRA OF C3 AND C3H2 FROM THE FLASH PHOTOLYSIS OF DIAZOPROPYNE

1967 ◽  
Vol 45 (12) ◽  
pp. 4103-4111 ◽  
Author(s):  
A. J. Merer
Keyword(s):  
Absorption Spectrum ◽  
Free Radical ◽  
Ground State ◽  
Time Delays ◽  
Flash Photolysis ◽  
State Level ◽  
Vibrational Structure ◽  
Absorption Bands ◽  
Text Component ◽  
Ground State Level

The flash photolysis of diazopropyne (HC2∙CHN2) provides a particularly strong absorption spectrum of the free C3 radical. About 40 μs after the photolysis flash, the appearance of the [Formula: see text] (4 050 Å) system of C3 is similar to that obtained in the flash photolysis of diazomethane by Gausset, Herzberg, Lagerqvist, and Rosen, though much more intense. The intensity of the spectrum has permitted a study of the l-type doubling effect in the ground-state level 6ν2, of which the [Formula: see text] component has been found to lie at 458.2 cm−1. At shorter time delays [Formula: see text] the spectrum is complicated by bands arising from the levels ν1″ (1 224.5 cm−1) and 2ν1″ (2 436.0 cm−1).Below 3 700 Å the C3 spectrum is overlapped by absorption bands belonging to a new free radical, which has been identified from the intensity alternation in the rotational structure as the HCCCH radical. The vibrational structure of this system is exceptionally complex, and analysis has not been possible. The bands extend to about 3 100 Å, but are predissociated below 3 450 Å.

scholarly journals Hyperfine level structure in nitrogen-vacancy centers near the ground-state level anticrossing

2019 ◽  
Vol 100 (7) ◽  
Author(s):  
Marcis Auzinsh ◽  
Andris Berzins ◽  
Dmitry Budker ◽  
Laima Busaite ◽  
Ruvin Ferber ◽  
...  
Keyword(s):  
Ground State ◽  
Level Structure ◽  
State Level ◽  
Nitrogen Vacancy ◽  
Nitrogen Vacancy Centers ◽  
Ground State Level

Upconversion Luminescence Study of Er3+ in Gadolinium-Calcium- Silicoborate Glasses

2013 ◽  
Vol 770 ◽  
pp. 249-253 ◽  
Author(s):  
Jakrapong Kaewkhao ◽  
Hong Joo Kim ◽  
Smit Insiripong ◽  
Natthakridta Chanthima ◽  
Siriprapa Kaewjaeng ◽  
...  
Keyword(s):  
Excited States ◽  
Ground State ◽  
Upconversion Luminescence ◽  
Optical Devices ◽  
Electronic Transitions ◽  
Potential Candidate ◽  
Melt Quenching ◽  
Absorption Bands ◽  
Green Is ◽  
Glass Series

The new glass series were prepared in compositions 25Gd2O3-10CaO-10SiO2-(55-x) B2O3-xEr2O3 (where x is 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol %) by normal melt-quenching technique at the melting temperature of 1,400 °C. The optical spectra were measured and shown absorption bands were assigned to appropriate f-f electronic transitions of Er3+ ions from the 4I15/2 ground state to the following excited states: 4G11/2, 2H9/2, 4F5/2, 4F7/2, 2H11/2, 4S3/2, 4F9/2, 4I9/2 and 4I11/2. Single peak from upconversion luminescence was observed at 531 nm (green) is assigned to the 2H11/24I15/2. In this work, the strongest peak at 2.0 % mol of Er2O3 was observed. In this work, suggests that the Er3+ ion in gadolinium calcium silicoborate glasses possibly considered as a potential candidate for applications in upconversion-based optical devices.

scholarly journals Наблюдение когерентного пленения населенности в ансамблях NV-центров в алмазе в условиях антипересечения уровней основного состояния

2019 ◽  
Vol 127 (8) ◽  
pp. 260
Author(s):  
Р.А. Ахмеджанов ◽  
И.В. Зеленский ◽  
Л.А. Гущин ◽  
В.А. Низов ◽  
Н.А. Низов ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Ground State ◽  
State Level ◽  
Coherent Population Trapping ◽  
Crystal Axis ◽  
Trapping Effect ◽  
Population Trapping ◽  
Ground State Level ◽  
Nv Centers

We realize the coherent population trapping effect in ensembles of diamond NV-centers in the ground state level anticrossing regime when the sample is placed into a strong external magnetic field along the [111] crystal axis.

scholarly journals Ground-state level spin systems within Bernasconi model

2017 ◽  
Vol 161 ◽  
pp. 02013
Author(s):  
A.N. Leukhin ◽  
V.I. Bezrodnyi ◽  
A.A. Voronin ◽  
N.A. Kokovikhina
Keyword(s):  
Ground State ◽  
State Level ◽  
Spin Systems ◽  
Ground State Level

scholarly journals Kinetic Study of the Reaction of Rh(a4F9/2) with N2O, O2 and NO

1998 ◽  
Vol 17 (4) ◽  
pp. 219-237 ◽  
Author(s):  
Mark L. Campbell
Keyword(s):  
Gas Phase ◽  
Excited States ◽  
Ground State ◽  
Rate Constants ◽  
Room Temperature ◽  
Reaction Rate ◽  
Removal Rate ◽  
Reaction Rates ◽  
Bimolecular Reaction ◽  
Temperature Rate

The gas phase reactivity of Rh(a4F9/2) with N2O, O2 and NO is reported. Removal rate constants for the excited states of rhodium below 13,000cm-1 are also reported. The reaction rate of Rh(a4F9/2) with N2O is relatively temperature insensitive. The rate constants for the bimolecular reaction are described in Arrhenius form by (1.3±0.3)×10−12exp⁡(−1.3±0.8KJ/mol/RT)cm3s−1 The reaction rates of the a4F9/2 state with O2 and NO are pressure dependent. For O2, the limiting low-pressure thirdorder, K0, and limiting high-pressure second-order, K∞, room temperature rate constants in argon buffer are (6.6±0.6)×10−30cm6s−1 and (2.1±0.2)×10−11cm3s−1, respectively. For NO, K2 and K∞ are (1.3±0.2×10−30cm6s−1) and (2.1±0.4)×10−11cm3s−1, respectively. The removal rates of the excited states are faster than the ground state by a factor of 2 or more.

A reinterpretation of the unusual barochromism of azulene

2007 ◽  
Vol 85 (6) ◽  
pp. 432-437 ◽  
Author(s):  
Masami Okamoto ◽  
Satoshi Hirayama ◽  
Ronald P Steer
Keyword(s):  
Excited States ◽  
Room Temperature ◽  
Dipole Moments ◽  
Applied Pressure ◽  
Electronic States ◽  
Acetonitrile Solution ◽  
Analytical Relationship ◽  
Hypsochromic Shift ◽  
Absorption Bands ◽  
Solvatochromic Shifts

The UV–vis spectra of azulene in methylcyclohexane and acetonitrile solution at room temperature have been measured as a function of applied pressure in the 0.1–600 MPa range. The solvatochromic shifts are normal, but the barochromic shifts are unusual (hypsochromic shift in the S1–S0 absorption bands vs. normal bathochromic shifts in its S2–S0 and S3–S0 absorption bands). An analytical relationship between the barochromic shift and the differences in the polarizabilities and dipole moments of the two radiatively coupled electronic states has been derived. The unusual barochromism of azulene has been reinterpreted in terms of differences in the polarizabilities of azulene in its ground and excited states and the dominance of dispersive interactions in barochromism.Key words: barochromism, solvatochromism, azulene, polarizability, dipole moment.

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