Superficial and Fundamental Correspondences in the Terahertz/IR (6–15 THz) Absorption Spectra of Aspirin and Benzoic Acid

2018 ◽  
Vol 122 (34) ◽  
pp. 6886-6893 ◽  
Author(s):  
L. M. Lepodise ◽  
J. Horvat ◽  
R. A. Lewis
Keyword(s):  
Benzoic Acid ◽  
Absorption Spectra ◽  
Thz Absorption

scholarly journals Temperature dependent poly(L-lactide) crystallization investigated by Fourier transform terahertz spectroscopy

2021 ◽  
Author(s):  
Seiichiro Ariyoshi ◽  
Satoshi Ohnishi ◽  
Hikaru Mikami ◽  
Hideto Tsuji ◽  
Yuki Arakawa ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Absorption Spectra ◽  
Terahertz Spectroscopy ◽  
Thz Spectroscopy ◽  
Frequency Range ◽  
Temperature Dependent ◽  
Thz Absorption

Poly(L-lactide) (PLLA) was investigated by Fourier transform terahertz (THz) spectroscopy over the frequency range of 1.0 – 8.5 THz. THz absorption spectra were acquired for PLLA samples isothermally crystallized at...

Ultraviolet absorption spectra of monomer and dimer of benzoic acid

1962 ◽  
Vol 8 (1-6) ◽  
pp. 257-275 ◽  
Author(s):  
Haruo Hosoya ◽  
Jiro Tanaka ◽  
Saburo Nagakura
Keyword(s):  
Benzoic Acid ◽  
Absorption Spectra ◽  
Ultraviolet Absorption

Absorption spectra of benzoic acid in water at different pH and in the presence of salts: insights from the integration of experimental data and theoretical cluster models

2020 ◽  
Vol 22 (9) ◽  
pp. 5046-5056 ◽  
Author(s):  
Natalia V. Karimova ◽  
Man Luo ◽  
Vicki H. Grassian ◽  
R. Benny Gerber
Keyword(s):  
Experimental Data ◽  
Electronic Structure ◽  
Benzoic Acid ◽  
Absorption Spectra ◽  
Aqueous Media ◽  
Small Cluster ◽  
Cluster Models ◽  
Microscopic Interpretation

The microscopic interpretation of the electronic structure and absorption spectra of BA in aqueous media through calculations restricted to small cluster models.

Linewidth Extraction From the THz Absorption Spectra Using a Modified Lorentz Model

2013 ◽  
Vol 34 (10) ◽  
pp. 617-626 ◽  
Author(s):  
Zhi Li ◽  
Zhaohui Zhang ◽  
Xiaoyan Zhao ◽  
Haixia Su ◽  
Han Zhang ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Lorentz Model ◽  
Thz Absorption

Experimental and theoretical study of the THz absorption spectra of selected tripeptides

2005 ◽  
Author(s):  
Frank Rutz ◽  
R. Wilk ◽  
T. Kleine-Ostmann ◽  
J. Grunenberg ◽  
Martin Koch
Keyword(s):  
Absorption Spectra ◽  
Theoretical Study ◽  
Thz Absorption

Spectrophotometric Determination of Some Preservatives in Milk

1977 ◽  
Vol 60 (5) ◽  
pp. 1175-1179
Author(s):  
Abdel-Aziz M Wahbi ◽  
Hassan Abdine ◽  
Salah M Blaih
Keyword(s):  
Benzoic Acid ◽  
Absorption Spectra ◽  
Spectrophotometric Determination ◽  
Sorbic Acid ◽  
Percentage Error ◽  
Milk Samples ◽  
First Derivative

Abstract Benzoic acid, propyl p-hydroxybenzoate, and sorbic acid in milk have been determined by using the corresponding first derivative curves of absorption spectra of clarified milk samples. The ΔA/Δλ curves were computed and the concentration of each preservative was calculated using 1 point, 2 points, and/or 3 points. In all cases, the percentage error was within 2.4%.

scholarly journals Terahertz Absorption Spectroscopy of Benzamide, Acrylamide, Caprolactam, Salicylamide, and Sulfanilamide in the Solid State

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Ye Jiang ◽  
Fengshan Zhou ◽  
Xiaodong Wen ◽  
Limin Yang ◽  
Guozhong Zhao ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Solid State ◽  
Absorption Spectra ◽  
Density Functional ◽  
Room Temperature ◽  
Solid Phase ◽  
Absorption Bands ◽  
Functional Theory ◽  
Terahertz Absorption ◽  
Thz Absorption

Terahertz (THz) absorption spectra of the similarly structured molecules with amide groups including benzamide, acrylamide, caprolactam, salicylamide, and sulfanilamide in the solid phase at room temperature and 7.8 K for salicylamide are reported and compared to infrared vibrational spectral calculations using density functional theory. The results of THz absorption spectra show that the molecules have characteristic bands in the region of 0.2–2.6 THz (~7–87 cm−1). THz technique can be used to distinguish different molecules with amide groups. In the THz region benzamide has three bands at 0.83, 1.63, and 1.73 THz; the bands are located at 1.44 and 2.00 THz for acrylamide; the bands at 1.24, 1.66 and 2.12 THz are observed for caprolactam. The absorption bands are located at 1.44, 1.63, and 2.39 THz at room temperature, and at 1.22, 1.46, 1.66, and 2.41 THz at low temperature for salicylamide. The bands at 1.63, 1.78, 2.00, and 2.20 THz appear for sulfanilamide. These bands in the THz region may be related to torsion, rocking, wagging, and other modes of different groups in the molecules.

Structurally Sensitive Changes in Absorption THz Spectra of Corticosteroids

2010 ◽  
Vol 5 (4) ◽  
pp. 162-167
Author(s):  
Irina N. Smirnova ◽  
Elena V. Fedulova ◽  
Maxim M. Nazarov ◽  
Оlga P. Cherkasova
Keyword(s):  
Steroid Hormones ◽  
Absorption Spectra ◽  
Time Domain ◽  
Spectral Response ◽  
Frequency Range ◽  
Terahertz Time Domain Spectroscopy ◽  
Characteristic Lines ◽  
Pure Substances ◽  
Thz Absorption ◽  
The Given

The series of steroid hormones, such as progesterone, 17α-hydroxyprogesterone, cortisol and other was measured by terahertz time-domain spectroscopy (THz TDS). It was obtained that THz absorption spectra of steroid hormones have characteristic lines of absorption in the frequency range 0.1-3.0 THz. We investigate the relation between the position of side functional groups and THz spectral response. Besides pellets of polycrystalline pure substances, steroids solution in methanol was analyzed. The given method can be applied for express diagnostics of different classes of steroid

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