Photochemistry can be dramatically different from “ordinary” chemistry See example below.

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Presentation transcript:

Photochemistry can be dramatically different from “ordinary” chemistry See example below

Ar Cl

Ar Cl...

Ar

Cl Ar + -

Cl Ar

O3 O3O3 Cl Hvernig er efnafræði ósoneyðingar- innar?/ Ozon depletion?

( ) 20 km ( )

Heildarloftstyrkur og ósonstyrkur yfir jörðu. / Concentration profiles for air and ozone in the Earth´s atmosphere.

20 km

Gleypni ósons á nær-útfjólubláa litrófssviðinu. Gleypnistuðull er í réttu hlutfalli við gleypni efnisins fyrir fastann efnisstyrk. Absorption cross section of ozone in the near UV spectral region.

20 km

20 km O 3 + O -> O 2 +O 2

Chemistry and spectroscopy of the greenhouse effect/ Global warming effects(?)

Gegnskin og gleypni andrúmsloftsins ÚF SÝNSÝN IR

Bylgjulengd (  m) Gleypni O=C=OO=C=O

UltravioletVisibleNear-IRInfraredFar-InfraredMicrowave

Organic photochemistry: photoisomerization

Stilben e(1)

Stilbene(2)

Astrochemistry

C2H2C2H2 Big organic molecules : Life(?) ???

C2H2C2H2 Big organic molecules : Life(?) ???

C2H2C2H2 Big organic molecules : Life(?) ??? C2C2 C CH 2

H+H+ CH + CH 2 + C+C+ C2+C2+ C2H+C2H+ C2H2+C2H2+ Magn jóna Ion yield LASER radiation of C 2 H 2 Mw Time of flight

Orka HCCH: HCCH*:

Orka C2C2 H2H2 HCCH*: C2C2 + +

Orka HCCH*:

Orka HCCH*: CH 2 C

A + M ??? M 1 + M 2 ??? A + B C + D Reaction cross section:

A + M ??? M 1 + M 2 ??? A + B C + D Cross section =  = 2  d But ions: Reaction cross section:

A + + B C + D But ions: F  1/r 2 Reaction cross section:

+ A + + B C + D But Ions: Reaction cross section:

A + + B C + D But ions: ++ Collision frequency much larger Reaction cross section:

A + M ??? M 1 + M 2 ??? A + B C + D d + Ions: Collision cross section =  >> 2  Reaction cross section: