CHEM 304 - 2/10/12 I.B. Stratospheric chemistry: Ozone - The Chapman Mechanism - cont. Embedded Fundamentals - Photochemistry  KEEP READING CH 1  HW#3.

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Presentation transcript:

CHEM /10/12 I.B. Stratospheric chemistry: Ozone - The Chapman Mechanism - cont. Embedded Fundamentals - Photochemistry  KEEP READING CH 1  HW#3 is out… and you should be working on it!

Photochemical Reactivity: 3 KEY questions 1) What wavelength does molecule absorb? 2) What altitudes are they available at? 3) Does the radiation carry enough E to break a bond ? (almost always YES!) (We’ll take these in 3 —> 1 —> 2 order …)

The Electromagnetic Spectrum

How much energy does a 400 nm “photon” carry? E photon = 5.0 x J h= 6.63 x J sec c=3.0 x 10 8 m/sec

What is the wavelength ( )of a photon with E = 6.0 x J? = 3.32 x m = 332 nm h = 6.63 x J sec c = 3.0 x 10 8 m/sec

A spectroscopy measurement … SAMPLE I o = MT I = sample D  = “absorption cross-section” units of cm 2 (or cm 2 /molec.)

Absorption bands of O3…

Absorption bands of O2…

Light Penetration… < 200 nm only HI stratosphere & above nm —> filtered in stratosphere VARIABLE w/ ALT. ( O 2 & O 3 absorption, O 3 absorption) > 300 nm —> penetrates to surface!

Vertical distribution of [M] … <— not enough M for O 3 production up high <— no <242 down here!