Expanding the strong absorption band by impedance matched mosquito-coil-like acoustic metamaterials

2020 ◽  
Vol 91 (2) ◽  
pp. 025102
Author(s):  
Mingming Hou ◽  
Junxiang Wu ◽  
Shaokun Yang ◽  
Jiu Hui Wu ◽  
Fuyin Ma
Keyword(s):  
Absorption Band ◽  
Strong Absorption ◽  
Acoustic Metamaterials ◽  
Mosquito Coil ◽  
Strong Absorption Band

scholarly journals Observation of precursorlike behavior of femtosecond pulses in a dye with a strong absorption band

2011 ◽  
Vol 83 (4) ◽  
Author(s):  
Matthew M. Springer ◽  
Wenlong Yang ◽  
Alexandre A. Kolomenski ◽  
Hans A. Schuessler ◽  
James Strohaber ◽  
...  
Keyword(s):  
Absorption Band ◽  
Strong Absorption ◽  
Femtosecond Pulses ◽  
Strong Absorption Band

Absorption of OH in the 1200 Å Region

1974 ◽  
Vol 52 (4) ◽  
pp. 318-323 ◽  
Author(s):  
A. E. Douglas
Keyword(s):  
High Resolution ◽  
Absorption Band ◽  
Rydberg State ◽  
Strong Absorption ◽  
Absorption Lines ◽  
Strong Absorption Band ◽  
Interstellar Absorption

A strong absorption band of OH has been observed near 1221 Å. From the analysis of high resolution spectra, it has been determined that the upper state is a 2Σ− Rydberg state and the constants of the OH and the corresponding OD state have been obtained. It is shown that the new absorption band will give interstellar absorption lines of OH at 1221.166, 1222.071, and 1222.524 Å. New constants have also been determined for the A2Σ+ and X2Π states of OD.

Determination of Strong Absorption Band Profiles of Low-Temperature Liquids from Reflection Spectra: The ν3 Band of Liquefied Tetrafluoromethane (CF4)

2015 ◽  
Vol 69 (4) ◽  
pp. 507-512 ◽  
Author(s):  
Pavel K. Sergeev ◽  
Dmitriy N. Shchepkin ◽  
Tatiana D. Kolomiitsova ◽  
Vladimir V. Bertsev ◽  
Ruslan E. Asfin
Keyword(s):  
Low Temperature ◽  
Absorption Band ◽  
Strong Absorption ◽  
Reflection Spectra ◽  
Strong Absorption Band

scholarly journals ON THE INFRARED ABSORPTION OF WATER AND HEAVY WATER IN CONDENSED STATES

1956 ◽  
Vol 34 (6) ◽  
pp. 798-808 ◽  
Author(s):  
Paul A. Giguère ◽  
K. B. Harvey
Keyword(s):  
Thin Films ◽  
Absorption Band ◽  
Water Molecule ◽  
Air Temperature ◽  
Heavy Water ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Silver Chloride ◽  
Strong Absorption Band ◽  
Librational Mode

The infrared spectra (from 2 to 30 μ) of thin films of H2O and D2O were measured at various temperatures between 20 ° and −180 °C. A strong absorption band due to the librational mode of the water molecule has its maximum around 710 cm.−1 in the liquid. In ice it is shifted to 800 cm.−1 at −15 °C. and 850 cm.−1 at −170 °C. The corresponding D2O bands show the normal isotope shift. Thin films of water pressed between silver chloride plates could not be crystallized even at liquid air temperature as confirmed by their spectra, which were almost identical with those of the liquid.

Nitrogenous chelate complexes of transition metals. VII. Complexes of silver(I) and silver(II) with tridentate chelating ligands

1970 ◽  
Vol 23 (6) ◽  
pp. 1125 ◽  
Author(s):  
CM Harris ◽  
TN Lockyer
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Absorption Band ◽  
Magnetic Moments ◽  
Chelating Ligands ◽  
Chelate Complexes ◽  
Complex Ions ◽  
Strong Absorption Band ◽  
Stable Species ◽  
Complexes Of Transition Metals

Silver(1) complexes of 2,2',2"-terpyridine and a related Schiff base chelate 8-(or-pyridylmethyleneamino)quinoline have been prepared. They are of the type Ag(chelate)X, where X = NO3, ClO4, and PF6. Both Ag(terpy)+ and Ag(pmq)+ are stable in solution and conductance measurements have been obtained. Ag(terpy)PF6 is monomeric in nitrobenzene. Reaction of the above complex ions with pyridine or triphenylphosphine affords stable species of the form [Ag(chelate)(py)]+ and [Ag(chelate)(Ph3P)]+ which have been isolated as their perchlorate salts. Both Ag(chelate)+ and [Ag(ohelate)L]+ involve unusual stereochemistry for AgI. The known paramagnetic AgII complexes Ag(terpy)X2 (X = NO3, ClO4, �S2O8) have been reprepared. They are unstable in solution and reduce readily to AgI. They all show magnetic moments in the range 1.7-1.9 B.M. Ag(terpy)2+ in an aqueous solution of CeIv shows a strong absorption band at 470 mμ (880).

Smoky, blue, greenish yellow, and other irradiation-related colors in quartz

1977 ◽  
Vol 41 (319) ◽  
pp. 301-312 ◽  
Author(s):  
K. Nassau ◽  
B. E. Prescott
Keyword(s):  
Absorption Band ◽  
Absorption Spectroscopy ◽  
Fused Silica ◽  
Blue Color ◽  
Strong Absorption Band ◽  
Synthetic Quartz ◽  
Low Intensity ◽  
Greenish Yellow ◽  
Absorption Features ◽  
Natural And Synthetic

SummaryAlmost 400 specimens of natural and synthetic quartz were γ-irradiated and then heated. Polarized absorption spectroscopy, EPR, and spectrochemical analysis were used to investigate the various colors produced.A blue color originated from absorption by the A1 and A2 bands at 1·85 and 2·55 eV. The substitutional A1 EPR hole-type center usually considered to be the cause of the color in smoky quartz does not correlate with A1 and A2, but with A3, a previously unreported absorption band at 2·90 eV. The A1 and A2 absorptions bleach at temperatures as low as 280 °C and as high as 360 °C the range for A3 being 140 to 380 °C. The B band at 3·95 eV was previously reported only in irradiated fused silica.Greenish-yellow colors (appearing yellow when of low intensity) were observed after irradiation (followed by heating in some instances) in many specimens of natural and synthetic quartz; the color originates from the tail of a strong absorption band in the ultraviolet. The bleaching temperature range is the same as that for A2.The wide variation in color of natural and irradiated smoky quartz can be explained by combinations of the smoky (A3), blue (A1 and A2), and greenish yellow absorption features.

Optical Absorption Spectra of Phosphonyl Radicals

1984 ◽  
Vol 39 (5) ◽  
pp. 434-436 ◽  
Author(s):  
T. Sumiyoshi ◽  
A. Henne ◽  
P. Lechtken ◽  
W. Schnabel
Keyword(s):  
Free Radicals ◽  
Absorption Band ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
General Structure ◽  
Laser Flash ◽  
Type I ◽  
Phosphine Oxides ◽  
Optical Absorption Spectra ◽  
Strong Absorption Band

Upon UV-irradiation, various phosphine oxides of the general structure I were found to be fragmented readily into free radicals I′ and I″ Laser flash photolysis studies revealed that radicals of type I" with R2 and/or R3 being phenyl groups possess a strong absorption band with a maximum around 330 nm. ε335nm= 1.9×104 1/mol cm was estimated for diphenyl phosphonyl radicals (Ph2P = O).

scholarly journals Methanogenesis Potentials: Insights from Mineralogical Diagenesis, SEM and FTIR Features of the Permian Mikambeni Shale of the Tuli Basin, Limpopo Province of South Africa

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 651
Author(s):  
George Oluwole Akintola ◽  
Francis Amponsah-Dacosta ◽  
Steven Rupprecht ◽  
Nithyadharseni Palaniyandy ◽  
Sphiwe Emmanuel Mhlongo ◽  
...  
Keyword(s):  
Absorption Band ◽  
Reaction Pathway ◽  
Limpopo Province ◽  
Carbonaceous Shale ◽  
Burial Depth ◽  
Low Grade ◽  
Microbial Activities ◽  
Replacement Reaction ◽  
Strong Absorption Band ◽  
Shale Formations

Carbonaceous shale is more topical than ever before due to the associated unconventional resources of methane. The use of FTIR, SEM-EDX, and mineralogical analyses has demonstrated a promising approach to assess methanogenesis potentials in a more rapid and reliable manner for preliminary prospecting. Representative core samples from the borehole that penetrated the carbonaceous Mikambeni shale Formations were investigated for methanogenesis potentials. The absorption band stretches from 1650 cm−1 to 1220 cm−1 in wavenumber, corresponding to C-O stretching and OH deformation of acetic and phenolic groups in all studied samples, thereby suggesting biogenic methanogenesis. The CO2 was produced by decarboxylation of organic matter around 2000 cm−1 and 2300 cm−1 and served as a source of the carboxylic acid that dissolved the feldspar. This dissolution process tended to release K+ ions, which facilitated the illitization of the smectite minerals. The SEM-EDX spectroscopy depicted a polyframboidal pyrite structure, which indicated a sulfate reduction of pyrite minerals resulting from microbial activities in an anoxic milieu and causes an increase in alkalinity medium that favors precipitation of dolomite in the presence of Ca and Mg as burial depth increases. The contact diagenesis from the proximity of Sagole geothermal spring via Tshipise fault is suggested to have enhanced the transformation of smectite to chlorite via a mixed layer corrensite in a solid-state gradual replacement reaction pathway. The presence of diagenetic chlorite mineral is characteristic of low-grade metamorphism or high diagenetic zone at a temperature around 200 °C to 230 °C and corresponds to thermal breakdown of kerogen to methane at strong absorption band around 2850 cm−1 and 3000 cm−1, indicating thermal methanogenesis.

Synthesis of flower-like CuS hollow microspheres based on nanoflakes self-assembly and their microwave absorption properties

2015 ◽  
Vol 3 (19) ◽  
pp. 10345-10352 ◽  
Author(s):  
Biao Zhao ◽  
Gang Shao ◽  
Bingbing Fan ◽  
Wanyu Zhao ◽  
Yajun Xie ◽  
...  
Keyword(s):  
Absorption Band ◽  
Microwave Absorption ◽  
Self Assembly ◽  
Hollow Microspheres ◽  
Strong Absorption ◽  
Band Width ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Wide Absorption Band

The flower-like CuS hollow microspheres exhibit the advantages of strong absorption, thin thickness, wide absorption band width and lightweight.

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