photochemistry can be dramatically different from “ordinary” chemistry see example below
DESCRIPTION
Photochemistry can be dramatically different from “ordinary” chemistry See example below. Cl. Cl. Ar. Ljósefnafræði ; Dæmi / photochemistry example:. Cl. Cl. Ar. Ljósefnafræði ; Dæmi / photochemistry example:. Cl. Cl. Ar. Ljósefnafræði ; Dæmi / photochemistry example:. -. +. - PowerPoint PPT PresentationTRANSCRIPT
Photochemistry can be dramatically different from “ordinary” chemistry
See example below
Ar
ClCl
Ar
ClCl.
ClCl
Ar
ClClAr
+-
ClCl
Ar
O3
O3
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
O3 + O -> O2+O2
Chemistry and spectroscopy ofthe greenhouse effect/Global warming effects(?)
Gegnskin og gleypni andrúmsloftsins
ÚF SÝN ....................................IR...............................4.354.304.254.20
4.354.304.254.20
Bylgjulengd (m)
Gle
ypni
O=C=O
Ultraviolet Visible Near-IR Infrared Far-Infrared Microwave
Organic photochemistry:photoisomerization
Stilbene(1)
Stilbene(2)
Astrochemistry
C2H2
Big organicmolecules : Life(?)
???
C2H2
Bigorganic molecules : Life(?)
???
C2H2
Bigorganic molecules : Life(?)
???C2
CCH2
-14
-12
-10
-8
-6
-4
-2
0
x10
3
302520151050
Ion m as s (am u)
H+
CH+
CH2+
C+ C2+
C2H+
C2H2+
Mag
n jó
na
Ionyield
LASER radiation of C2H2
Mw Time of flight
Orka
HCCH:
HCCH*:
Orka
C2 H2
HCCH*:
C2
+
+
Orka
HCCH*:
Orka
HCCH*:
CH2C
A + M ???M1 + M2 ???A + B C + D
Reaction cross section:
A + M ???M1 + M2 ???A + B C + D
Cross section = = <d>2
d
But ions:
Reaction cross section:
A+ + B C + D
But ions:
-- -
-++
++
F 1/r2
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 ???M1 + M2 ???A + B C + D
d
+
Ions:
Collision crosssection = >> <d>2
Reaction cross section: