Chapter 16 – Infrared Spectroscopy. Introduction. Useful range from about 2.5 m m to 50 m m. Infrared used to determine the major functional groups present. Quantitative measurements possible but subject to large amount of error.
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k = force constant (N/m) and m = reduced mass (kg).
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Estimation of frequencies of vibration for various groups possible when force constant known.
E.g.1 force constant of C=O bond is 1.23x103 N/m, determine vibrational frequency of this C=O group.
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reduced mass for each of two bonds will be: mC = 1.99x1026 kg,
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Instrumental Methods of Analysis, Willard, Merritt, Dean & Settle, p. 193.
Null Point Wheatsone Bridge, Undergraduate Instrumental Analysis ,Robinson, p. 141.Thermal Detectors
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E.g. Determine the pathlength from the fringes below:
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