Valence-shell electron energy-loss spectra of formic acid and acetic acid

Date

2000-01-01

Author

Ari, T
Guven, MH

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

258
views

0
downloads

Gas phase optical absorption spectra of formic acid and acetic acid in the energy ranges 5.0-11.3 and 4.4-11.3 eV, respectively, have been previously recorded. It is generally agreed that of the four successive bands observed in the spectra of these compounds, the first corresponds to n --> pi* transition. However, various assignments have been proposed for the following three bands. In the present study, electron energy-loss spectra of formic acid and acetic acid vapours at 70 eV impact energy and 0 degrees scattering angle have been measured between 5-15 eV. The transition energies that have been observed coincide with those measured by optical methods in the corresponding range. To identify the valence shell transitions among the spectral features observed, the semi-empirical HAM/3 calculations have been performed. With the help of earlier studies on these and related compounds first and third bands are tentatively assigned as valence, whereas second and fourth bands are assigned as Rydberg.

Subject Keywords

Acetic acid, Formic acid, Gas phase optical absorption, Valence shell transition

URI

https://hdl.handle.net/11511/65867

Journal

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA

DOI

https://doi.org/10.1016/s0368-2048(99)00084-5

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Dimethyl Ether Synthesis over Novel Silicotungstic Acid Incorporated Nanostructured Catalysts Ciftci, Aysegul; VARIŞLI, DİLEK; Doğu, Timur (2010-01-01) Dimethyl ether (DME), which is an excellent green diesel-fuel alternate with excellent clean burning properties, is synthesized by dehydration of methanol over novel solid acid catalysts, which are synthesized following a direct hydrothermal route and using silicotungstic acid (STA) as the active compound. These mesoporous silicate structured catalysts have surface area values of 108-393 m(2)/g, depending upon their W/Si ratio. These catalysts showed very high methanol dehydration activity and also very hig...
RAMAN-SPECTROSCOPY OF SOFT AND RIGID MODES IN FERROELECTRIC TLINS2 BURLAKOV, VM; RYABOV, AP; YAKHEEV, MP; VINOGRADOV, EA; MELNIK, NN; Hasanlı, Nızamı (Wiley, 1989-06-01) Low‐frequency Raman spectra of a TlInS2 single crystal in the vicinity of a ferroelectric phase transition are reported. In the ferroelectric phase a soft mode interacting with some rigid modes is observed. The temperature dependence of the soft mode frequency is found to be proportional to (Tc – T)1/2. An unusual behaviour of the rigid mode (ω = 20 cm−1) is observed. This fact is interpreted in terms of inherent lattice defects which cause nonhomogeneous broadening.
Kinetic analysis of photosynthetic growth, hydrogen production and dual substrate utilization by Rhodobacter capsulatus Sevinc, Pelin; Gündüz, Ufuk; EROĞLU, İNCİ; Yucel, Meral (2012-11-01) Rhodobacter capsulatus is purple non-sulfur (PNS) bacterium which can produce hydrogen and CO2 by utilizing volatile organic acids in presence of light under anaerobic conditions. Photofermentation by PNS bacteria is strongly affected by temperature and light intensity. In the present study we present the kinetic analysis of growth, hydrogen production, and dual consumption of acetic acid and lactic acid at different temperatures (20, 30 and 38 degrees C) and light intensities (1500, 2000, 3000, 4000 and 50...
Conductimetric and potentiometric titration of some hydroxylated cinnamic acids with tetrabutylammonium hydroxide in non-aqueous media Aktas, AH; Yasar, G; Alsancak, O; Demirci, S (2001-01-01) In this study, four hydroxycinnamic acids, namely 3,4-dihydroxycinnamic acid, 4-hydroxycinnamic acid, 4-hydroxy -3- methoxycinnamic acid and 4-hydroxy-3,5-dimethoxycinnamic acid, were titrated conductimetrically and potentiometrically using triethylamine and tetrabutylammonium hydroxide in acetonitrile, 2-propanol, and pyridine solvents under a nitrogen atmosphere at 25 degreesC.
Terahertz spectroscopy of dicyanobenzenes: Anomalous absorption intensities and spectral calculations Esentürk, Okan; Heilweil, E. J. (2007-07-06) Terahertz absorption spectra of three isomeric structures of dicyanobenzene in chloroform solution and solid phase at 298 K are reported. These spectra exhibit enhanced absorption in low THz range compared to most organic systems because of strong coupling to phonon modes. Molecular vibrational spectral calculations show strong correlation with the experiment especially for solution spectra. All intramolecular modes were assigned and intermolecular modes identified. Out-of-plane intramolecular modes at low ...

Citation Formats

T. Ari and M. Guven, “Valence-shell electron energy-loss spectra of formic acid and acetic acid,” JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, pp. 29–35, 2000, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65867.