scholarly journals Below Band Gap Formation of Solvated Electrons in Neutral Water Clusters?

2020 ◽  
Vol 124 (39) ◽  
pp. 7959-7965
Author(s):  
Loren Ban ◽  
Christopher W. West ◽  
Egor Chasovskikh ◽  
Thomas E. Gartmann ◽  
Bruce L. Yoder ◽  
...  
Keyword(s):  
Band Gap ◽  
Water Clusters ◽  
Gap Formation ◽  
Solvated Electrons ◽  
Neutral Water

Band Gap Formation in Composite Models With Quasi-Random Fiber Arrangements

2005 ◽  
Author(s):  
Shashidhar Patil ◽  
Liang-Wu Cai
Keyword(s):  
Band Gap ◽  
Large Scale ◽  
Composite Plates ◽  
Two Dimensions ◽  
Band Gaps ◽  
Gap Formation ◽  
Statistical Parameters ◽  
Composite Models ◽  
Gap Characteristics ◽  
Primary Band

Large-scale deterministic simulations are performed in order to observe the band gap formation in composite models having quasi-random fiber arrangements. Composite plates are modeled in two-dimensions with various unidirectional fiber arrangements. The quasi-random fiber arrangements can be qualified as essentially regular with slight randomness. Simulation results are compared with the corresponding case of ideally regular fiber arrangement. The most interesting observation is that the slight randomness in the fiber arrangements enhances the band gap phenomenon by introducing a few secondary band gaps adjacent to the primary band gap. An attempt is made to relate the band gap characteristics to the statistical parameters of fiber arrangements.

scholarly journals ACOUSTIC BAND GAP FORMATION IN METAMATERIALS

2010 ◽  
Vol 24 (25n26) ◽  
pp. 4935-4945 ◽  
Author(s):  
D. P. ELFORD ◽  
L. CHALMERS ◽  
F. KUSMARTSEV ◽  
G. M. SWALLOWE
Keyword(s):  
Band Gap ◽  
Lattice Constant ◽  
Low Frequency ◽  
Band Gaps ◽  
Gap Formation ◽  
Individual Band ◽  
Resonance Band ◽  
Frequency Regime ◽  
Sonic Crystal ◽  
The Individual

We present several new classes of metamaterials and/or locally resonant sonic crystal that are comprised of complex resonators. The proposed systems consist of multiple resonating inclusion that correspond to different excitation frequencies. This causes the formation of multiple overlapped resonance band gaps. We demonstrate theoretically and experimentally that the individual band gaps achieved, span a far greater range (≈ 2kHz) than previously reported cases. The position and width of the band gap is independent of the crystal's lattice constant and forms in the low frequency regime significantly below the conventional Bragg band gap. The broad envelope of individual resonance band gaps is attractive for sound proofing applications and furthermore the devices can be tailored to attenuate lower or higher frequency ranges, i.e., from seismic to ultrasonic.

scholarly journals Infrared spectroscopy of neutral water clusters at finite temperature: Evidence for a noncyclic pentamer

2020 ◽  
Vol 117 (27) ◽  
pp. 15423-15428 ◽  
Author(s):  
Bingbing Zhang ◽  
Yong Yu ◽  
Yang-Yang Zhang ◽  
Shukang Jiang ◽  
Qinming Li ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectra ◽  
Liquid Water ◽  
Vacuum Ultraviolet ◽  
Water Clusters ◽  
Bulk Water ◽  
Infrared Spectroscopic Study ◽  
Stretching Vibration ◽  
Hydrogen Bonding Networks ◽  
Neutral Water

Infrared spectroscopic study of neutral water clusters is crucial to understanding of the hydrogen-bonding networks in liquid water and ice. Here we report infrared spectra of size-selected neutral water clusters, (H2O)n(n= 3−6), in the OH stretching vibration region, based on threshold photoionization using a tunable vacuum ultraviolet free-electron laser. Distinct OH stretch vibrational fundamentals observed in the 3,500−3,600-cm−1region of (H2O)5provide unique spectral signatures for the formation of a noncyclic pentamer, which coexists with the global-minimum cyclic structure previously identified in the gas phase. The main features of infrared spectra of the pentamer and hexamer, (H2O)n(n= 5 and 6), span the entire OH stretching band of liquid water, suggesting that they start to exhibit the richness and diversity of hydrogen-bonding networks in bulk water.

Direct Graphene Growth on Oxides: Interfacial Interactions and Band Gap Formation

2012 ◽  
Vol 45 (4) ◽  
pp. 49-61 ◽  
Author(s):  
J. A. Kelber ◽  
M. Zhou ◽  
S. Gaddam ◽  
F. L. Pasquale ◽  
L. M. Kong ◽  
...  
Keyword(s):  
Band Gap ◽  
Gap Formation ◽  
Interfacial Interactions ◽  
Graphene Growth

Structures, relative stability and binding energies of neutral water clusters, (H2O)2–30

2019 ◽  
Vol 43 (33) ◽  
pp. 13020-13037 ◽  
Author(s):  
Alhadji Malloum ◽  
Jean Jules Fifen ◽  
Zoubeida Dhaouadi ◽  
Serge Guy Nana Engo ◽  
Jeanet Conradie
Keyword(s):  
Relative Stability ◽  
Cluster Size ◽  
Water Clusters ◽  
Binding Energies ◽  
Neutral Water

We have revised the structures of neutral water clusters, (H2O)n=2–30, with the affordable M06-2X functional, presenting up to 25 isomers for each cluster size.

scholarly journals Band Gap Formation and Multiple Scattering in Photonic Quasicrystals with a Penrose-Type Lattice

2005 ◽  
Vol 94 (18) ◽  
Author(s):  
A. Della Villa ◽  
S. Enoch ◽  
G. Tayeb ◽  
V. Pierro ◽  
V. Galdi ◽  
...  
Keyword(s):  
Band Gap ◽  
Multiple Scattering ◽  
Gap Formation ◽  
Photonic Quasicrystals ◽  
Type Lattice
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