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Lecture 4 Spectroscopy

# Lecture 4 Spectroscopy - Chapter 7 Spectroscopy Wave-nature...

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Chapter 7 Spectroscopy

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Wave-nature or Light Light waves consist of perpendicular, oscillating electric and magnetic fields
Some Reminders about waves The distance between corresponding points on adjacent waves is the __________ . Generally this is measured from max to max (or from min to min). Amplitude increases with the amount of ________ that caused the wave (pebble thrown into a pond causes smaller crest than a tsunami caused by an earthquake). wavelength, λ energy

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Waves The number of waves passing a given point per unit of time is the ____________. For waves traveling at the same velocity, the longer the wavelength, the _________ the frequency. frequency ( ν ) . lower
How is energy of electromagnetic radiation related to its frequency? E = h ν = h(c/λ) c = λν How is frequency related to wavelength? h = 6.626*10 -34 Js = Plank’s constant

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Waves ν° = 1/λ or ν/ c λ: length of one period ν: # of periods per unit time ν°: # periods per unit distance c: distance covered per unit time (2.998*10 8 m/s) 2cm
UV, IR, Microwave

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Spectro photo metry: any procedure that uses _____ to measure chemical concentrations . light Irradiance (P) : Energy per s per unit area of the light beam Monochromator: prism/grating/ filter Pathlength (b): thickness of sample the beam has to traverse Attenuated Irradiance (P) : Energy that is left after the sample has absorbed some
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