Infrarot-Spektroskopie diffus reflektierender Proben

Korte, Ernst‐Heiner

doi:10.1007/978-3-642-72590-6_3

Cited by 3 publications

(2 citation statements)

References 119 publications

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“…All absorption bands in the CH stretching region are very weak and require the use of the DR technique which favours the observation of weak bands in the IR region. 54 Besides the already mentioned n 1 mode there are absorption bands at about 3084 and 2986 cm À1 which are assigned to the n 9 mode, the n 5 mode that is probably hidden under the broad band around 3084 cm À1 , and the n 11 mode. The corresponding CH stretching modes of free ethylene show b 2u , b 3g and b 1u symmetry, respectively, which means that the n 5 mode is activated by adsorption (see Table 1).…”

Section: Resultsmentioning

confidence: 92%

FTIR measurements and quantum chemical calculations of ethylene adsorbed on CuNaY

Hübner

Rauhut

Stoll

et al. 2002

Phys. Chem. Chem. Phys.

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Section: Resultsmentioning

confidence: 92%

FTIR measurements and quantum chemical calculations of ethylene adsorbed on CuNaY

Hübner

Rauhut

Stoll

et al. 2002

Phys. Chem. Chem. Phys.

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“…The spatial resolution of the measurements was about 1 mm, but definitely below 1.5 mm due to the infrared spot size on the sample. The IR radiation is reflected from the sample surface in all directions, and therefore DRIFTS requires a special mirror arrangement (Mitchell 1993;Fraser & Griffiths 1990;Korte 1988;Kortum & Delfs 1964). The output mirror directs this scattered radiation to the detector in the spectrometer to record the collected IR light as an interferogram signal, which is used to generate a spectrum.…”

Section: Methodsmentioning

confidence: 99%

Irradiation induced mineral changes of NWA10580 meteorite determined by infrared analysis

Gyollai,

Biri,

Juhász

et al. 2024

A&A

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Identifying minerals on asteroid surfaces is difficult as space weathering modifies the minerals' infrared spectra. This should be better understood for proper interpretation. We simulated the space weathering effects on a meteorite and recorded the alterations of the crystalline structure, such as the change in peak positions and full width at half maximum values. We used proton irradiation to simulate the effects of solar wind on a sample of NWA 10580 CO3 chondrite meteorites. After irradiation in three gradually increased steps with 1 keV ion energy, we used infrared microscopic reflectance and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) to identify and understand the consequences of irradiation. We find negative peak shifts after the first and second irradiations at pyroxene and feldspar minerals, similarly to the literature, and this shift was attributed to Mg loss. However, after the third irradiation a positive change in values in wavenumber emerged for silicates, which could come from the distortion of SiO$_4$ tetrahedra, resembling shock deformation. The full width at half maximum values of major bands show a positive (increasing) trend after irradiations in the case of feldspars, using IR reflection measurements. Comparing DRIFTS and reflection infrared data, the peak positions of major mineral bands were at similar wavenumbers, but differences can be observed in minor bands . We measured the spectral changes of meteorite minerals after high doses of proton irradiation for several minerals. We show the first of these measurements for feldspars; previous works only presented pyroxene, olivine, and phyllosilicates.

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Elektrochemische Methoden

Maier¹

1990

Lebensmittel- Und Umweltanalytik

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Infrarot-Spektroskopie diffus reflektierender Proben

Cited by 3 publications

References 119 publications

FTIR measurements and quantum chemical calculations of ethylene adsorbed on CuNaY

FTIR measurements and quantum chemical calculations of ethylene adsorbed on CuNaY

Irradiation induced mineral changes of NWA10580 meteorite determined by infrared analysis

Elektrochemische Methoden

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