Frequencies in IR are generally expressed in 1/ λ units; ie cm-1 since Infrared Spectroscopy E vib = (n+1/2)h(k/μ) 5/2 π where μ = m 1 m 2 /(m 1 +m 2 asymmetric NH2 stretches Wavenumbers, cm-1 500 1000 1500 2000 2500
LectureIR
since wavelengths are usually very small one often uses the nano meter (nm) m The frequency ν in the SI system is measured in reciprocal seconds 1 s − cm/m or 656 5 x 10 -7 cm or 1 523x10 4 cm -1 We can convert this to Hz by
wavenumbers
Video Tutorial 1: Elementary problem stretching line at 2000 cm -1 to the bond axis is given by where is the bond distance QUESTION 5 1 m 2 m I 2 I rμ
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Convert lengths: Bingo caller's sheet 0 1 km 1 m 0 1 m 1 cm 100 m 100 cm 100 mm 10 mm 0 2 km 2 m 0 03 km 0 3 m 200 m 2000 mm 30 m 300 mm
FSMA Convert lengths cards
2000 3600 3400 3200 3000 2800 2600 2400 wavenumber [cm ]-1 3 2 CH m kg s–2 Pressure, Stress Pascal Pa N m–2 = m–1 kg s–2 [1 bar = 105 Pa]
GuideforInfraredspectroscopy
Thus, 1 cm = 1/100 m = 0 01 m There are 1000 mm in a metre, Thus, 1 mm = 1/ 1000 m = 0 001 m Measure of Example Basic Units Metres (m) Litres (L)
conversions in the metric system
Copiable page 1 of 3 © Nuffield mm m or m mm A centimetre is one hundredth of a metre so cm m or m cm Think about F 2000 m = ______ km 3500 m
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Example 1: To convert 4200 cm to meters, write the units in order from largest to smallest km hm dam m dm cm mm Converting cm to m requires moving
math metric units of length
(d) the total energy (in Joules) associated with 1 mole of photons (b) The wave number is 1/wavelength, but since the wavelength is in m, and the wave number should be in cm–1, we first change the wavelength into cm: = 5 89 x 10
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has a strong infrared absorption between 1710 and 1740 cm-1. Mono substituted. 2000 cm-1. 1667cm-1. 910-890. 770-730. 710-680 m*.
15-May-2013 The gap in the spectrum between 700 & 800 cm-1 is due to ... cm. -1. Compare the spectra of nitromethane and m-nitrotoluene below.
(d) 800 cm-1. (i) ?m = (800 cm-1)-1 x (1 m/100 cm) x (106 ?m / m) = 12.5 ?m ? 13 ?m. (ii) c=??. (2.998x108 m/s) = (12.5 x 10-6 m)? ? = 2.398 x 1013 = 2.4 x
2000. 1000. X-H Regon. (2500-4000 cm-1). C-H. O-H. N-H. Triple Bond. Region. (2000-2500). C C. C N. Double Bond. Region. (1500-2000). Fingerprint Region.
2000-1650 cm–1. Aromatic C-C Stretches. 1600-1585; 1500-1400 cm–1. Aromatic C-H in plane bends. 1300-1000 cm–1 out of plane ring bending. 428 cm–1
1 km. 1 cm. 10 m. 100 cm. 200 mm. 100 m. 500 cm. 1 km. 1 m. 200 cm. 300 mm. Use greater than (>) less than (<) or equals (=) to compare the amounts. 1).
1 centimeter=1 one-hundredth of a meter Example 1: To convert 4200 cm to meters write the units in order from largest to smallest.
1 centimeter (cm) = 0.01 m. 1 meter = 100 centimeters. 1 millimeter (mm) = 0.001 m. 1 meter = 1000 millimeters. 1 millimeter (mm) = 0.1 cm.
1 cm = 10 mm. 100 cm = 1 m. 1000 mm = 1 m. 10 cm = 0.1 m. Ratio scales. If the scale of the plan is 1 : 100 this means the real measurements are 100 times
IR - spectroscopy