Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Time-resolved attenuated total reflectance

Figure 3.13. (d) Time-resolved attenuated total reflectance (ATR) Fourier transform infrared (FTIR) spectra collected during arsenic (As) oxidation on random stacked bimessite (RSB). Peaks represent the oxidation product, arsenate, adsorbed at the RSB surface. (Z ) As oxidation kinetic data collected on RSB (O) on hexagonal bimessite (H-Bi) ( ) during a batch experiment. Inset shows the peak height versus time plot for the spectra seen in the top panel, illustrating the higher time resolution achievable with rapid-scan ATR-FUR spectroscopy. (From Borda and Sparks, unpublished data, 2006.)... [Pg.117]

TIME-RESOLVED ATTENUATED TOTAL REFLECTION UV-VISIBLE SPECTROSCOPY... [Pg.26]

Fig. 2.7 A schematic diagram of the time-resolved attenuated total reflectance far-ultraviolet spectrometer that we developed... Fig. 2.7 A schematic diagram of the time-resolved attenuated total reflectance far-ultraviolet spectrometer that we developed...
Fig. 2.8 The attenuated total reflectance probe used as part of the time-resolved attenuated total reflectance far-ultraviolet spectrometer (a). An enlarged figure of the internal reflection element in side view (b) and bottom view (c)... Fig. 2.8 The attenuated total reflectance probe used as part of the time-resolved attenuated total reflectance far-ultraviolet spectrometer (a). An enlarged figure of the internal reflection element in side view (b) and bottom view (c)...
The monolayer also provides an environment of variable dielectric so that intermolecular association between photoactive molecules can readily occur. For example, molecular association of pyrene within a Langmuir-Blodgett film is clearly seen through time-resolved fluorescence measurements on the picosecond timescale [92], Attenuated total reflectance studies of dyes in cast films can similarly reveal their positions and photophysical interactions [93], Photochromism in a monolayer assembly has been attributed to excitation of ion-pair charge transfer complexes formed within the array [94]. [Pg.89]

Real-time attenuated total reflectance FTIR spectroscopy was used to follow the conversion during acrylate polymerisations by measuring the presence of functional groups at finite depths from the ciystal surface. By varying the film thickness, the reactivity of multiacrylates could be spatially resolved. These results were compared with results from different photocalorimetric studies. 22 refs. USA... [Pg.104]

Hallinan DT Jr, Elabd YA (2007) Difusion and sorption of methanol and water in Nafion using time-resolved Fourier transform infrared-attenuated total reflectance spectroscopy. J Phys Chem B 111 13221-13230... [Pg.219]

This time-resolved measurement method can be applicable to relatively slow transient phenomena, as its time-resolved measurements are undertaken while the movable mirror is at rest. The number of applications of step-scan FT-IR spectrometry to time-resolved measurements currently is more than that by any other method, and it has been applied to various studies in many fields such as studies of biomolecules, liquid crystals, polymers, photochemical reactions in zeolites, oxidation-reduction reactions on electrode surfaces, and excited electronic states of inorganic complexes. Further, this method has been applied to time-resolved measurements in combination with attenuated total reflection (ATR) (see Chapter 13), surface-enhanced infrared absorption (see Section 13.2.2) [10, 11], infrared microscopic measurements (see Chapter 16) [12], and infrared spectroscopic imaging (see Chapter 17) [13]. [Pg.293]

Abstract This chapter describes recent breakthroughs in the instrumentation for far-ultraviolet (FUV) spectroscopy. The key technique is attenuated total reflection (ATR) that is frequently used in the infrared region. ATR technique decreases the absorbance of samples with strong absorptivity because of the penetration depth of the evanescent wave less than 100 nm. Therefore, ATR-FUV spectroscopy realizes the measurement of FUV spectra of samples in liquid and solid states. Some applications (in-line monitoring, characterization of polymers and time-resolved spectroscopy in sub-microsecond) are introduced in terms of instrumentation. This chapter explains not only the detail of the instruments but also the mathematical correction for ATR spectra to separate the absorption and refraction indices. [Pg.17]

Keywords Attenuated total reflection (ATR) Internal reflection element Kramers-Kronig transformation Time-resolved ATR-FUV spectroscopy... [Pg.17]

See other pages where Time-resolved attenuated total reflectance is mentioned: [Pg.314]    [Pg.252]    [Pg.314]    [Pg.161]    [Pg.314]    [Pg.93]    [Pg.270]    [Pg.296]    [Pg.83]    [Pg.738]    [Pg.3722]    [Pg.144]    [Pg.296]    [Pg.101]    [Pg.252]    [Pg.35]    [Pg.881]   


SEARCH



ATTENUATED TOTAL

Attenuated total reflectance

Attenuated total reflectance Attenuation

Attenuation total reflection

Attenuator attenuated total reflection

Reflection, attenuated total

Reflectivity total

Time-resolved attenuated total reflectance spectroscopy

Total reflection

© 2024 chempedia.info