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Chapter 16: Q. 16.9 (page 410)

What are the major advantages of an FTIR spectrometer compared with a dispersive instrument?

Short Answer

Expert verified

The advantage FTIR over dispersive infrared instrument is evident in spectral quality, data collection speed, reproducibility of data, and ease of maintenance and use.

Step by step solution

01

Step 1. Given information

Give the major advantages of an FTIR spectrometer compared with a dispersive instrument.

02

Step 2. Advantages

FTIR has several advantages over dispersive, some of them are listed as below.

1. Improved frequency resolution.
2. Improved frequency reducibility.
3. It is faster in providing result.
4. It can do multiple scans faster
5. It has significantly higher signal-to-noise ratio of spectrum is
6. It has high accuracy of wave number
7. It allows the storage of spectra and has facilities for processing spectra.
8. It requires minimal or no sample preparation prior to spectral measurements.

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Most popular questions from this chapter

In a particular trace analysis via FTIR, a set of sixteen interferograms was collected. The signal-to-noise ratio (S/N) associated with a particular spectral peak was approximately 4:1. How many interferograms would have to be collected and averaged if the goal is to obtain an S/N = 20:1?

The force constant of the NO bond is approximately 1.53×103N/m. Treating the NO group as a simple diatomic molecule, calculate the absorption frequency in Hz and the wavelength and wavenumber of the fundamental absorption. How does this compare to the experimental value found for NO and NO dimers by Varetti, E. L.; Pimentel, G. C., J. Chem. Phys., 1971, 55, 3813, DOI: 10.1063/1.1676666.

It was stated that at room temperature (25°C) the majority of molecules are in the ground vibrational energy level (v = 0).
(a) Use the Boltzmann equation (Equation 8-1) to calculate the excited-state and ground-state population ratios for HCl: N(v =1)/N(v = 0). The fundamental vibrational frequency of HCl occurs at 2885 cm-1.

(b) Use the results of part (a) to find N(v = 2)/N(v = 0)

Calculate the absorption frequency corresponding to the -C-Hstretching vibration treating the group as a simple diatomic C-Hmolecule with a force constant of k=5×102N/m. Compare the calculated value with the range found in correlation charts (such as the one shown in Figure 17-6). Repeat the calculation for the deuterated bond.

The wavelength of the fundamental O-Hstretching vibration is about 3.0µm. What is the approximate wavenumber and wavelength of the first overtone band for the O-Hstretch?
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