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Section 4.1: Introduction to molecular spectroscopy - Chemwiki - Chromium f \ calmradio.com - spok- x ^T Ęj ir spectroscopy - Szuk x ^T Section 4.2: łnfrared xj Section 4.1: Introduci x Identification of polyr x ^T fg Facebook

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Because eleccromagne&c radiaoon travels at a constans speed each wavelength corresponds to a given frequency. which is me number of limes per second mat a crest passes a given point. Longer waves have lower frequencies. and snorter waves have higber frequencies. Frequency ts commonty reported in hertz (Hz), meanmg ‘cydes per second'. or *waves per second'. Tbe standard unit for trequency is s V

When tal king about electromagnetic waves. we can refer either to wavelengm or to frequency - me two va!ues are interconverted uslng me simple expression:

>v = C

where v (me Greek letter ‘ni/*) is frequency In S'¹. Vlsible red light wim a wavelengm of 700 nm. for exampłe. has a frequency of 4.29 x 10^u Hz. and an energy of 40.9 kcal per mole of photons.

Tbe fuli rangę of electromagneoc radiaoon wavefengms is referred to as me electromagnetic spectrum

higher energy

C ~    ~ '»

Mm) IO¹²

10

10

-io

10

-8

io-⁶

10“*

-2

10²

1
V rays	x-rays	uv		infrared	micro- wave	radio

/. (nm) 400

11

visiblc

c    I    "i

k    =    s

T

500

600

700

Notice in the figurę above (hal visible light takes up just a narrow band of the fuli spectrum White light from the sun or a light bulb is a mixture of an of the v>sibie waveiengths. you see the vns«bie region of the electromagnetic spectrum dmded mto its different waveiengths every time you see a rambow: violet light has the shortest wavelength, and red light has the longest.

Example

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