Infrared Waves  What are they?  Part of the electromagnetic spectrum

Electromagnetic Spectrum  Wave in space with electric and magnetic properties  Classified according to the frequency of the waves  Frequency is the number of waves that pass in a certain amount of time

Electromagnetic Spectrum  The higher the frequency the more energy is in the waves  When the frequency is very high the waves can have ionizing energy  Ionizing energy means it can change an atom or molecule into an ion  This can be extremely hazardous

Infrared Waves  Do you ever use infrared waves?

Electromagnetic Spectrum

Infrared Waves  Infra means below  Larger frequency than microwaves and smaller than visible light

Uses for IR Waves  Remote controls  Medical – Skin therapy  Military – Target acquisition  Short range wireless communication  Astronomy - Photography  Spectroscopy

Spectroscopy

Spectroscopy  What is it and how can we use it on rocks?  The study of the interaction between radiation, light, and matter.  kII/ftir1.asp kII/ftir1.asp kII/ftir1.asp

Fourier Transform Infrared

Spectroscopy  What is it and how can we use it on rocks?

Synchrotron Radiation Center

AM 0209 Line Map Aperture = 20x20 Step = 45 µm

AM 0211 Area Map Aperture = 20x20 Step = 30 µm

AM 0209 Spectra = % absorbanceX = % absorbanceX Straight Line French Curve Absorbance Determining the baseline can be very subjective

Absorbance to Wt% Calculation c = A / (Є b) A = absorbance from spectra Є= molar absorbtivity (L mol-1 cm-1) constant b = path length of the sample (cm) sample thickness c = concentration (mol L-1) Beer-Lambert Law

Wt % to Pressure Calculation  VolatileCalc, Newman and Lowenstern, 2002  Visual Basic for Excel  Pressure the magma was under when it crystallized (bars)

Ice Thickness Calculation Pressure converted from bars to mH 2 O mH 2 O divided by density of ice Ice thickness