PHOTO CHEMISTRY
His the bmnch ot chaisty consened manly wrth the hemial
efect induced by ndichion yring in the altaviokt& Vsible
eqpion ie In dhe waveength enge toom 2000 - 500of
H ts aER aleo deals wrth sevesal othes fhenomend nsso
Cioed with abeosftion ane emesion such adiahon by chemi
cal e n
lhotodhemial seacth
Chemical eath that ocuo undes he rtlHene ot ndiation aoecdle
fhotoche mical sert
Troeetypical exmples are
i)Thecombination of H &cl in the foecare ot ligat
h2tCl
)-the pioto surtikeis in Plants
6 COgt 6H2o 2g H t6
I1 The dimezizgtion of anth xance to diathztne in benze
Solution in w Pesene of v light
he
, Ihfact ze actins of eval
types axe ndeed ty laht in chemi Photochemisty
cal anel biolical syero
e1y0tthuss- Doapes law states thtt "only hose zadiatins
Dierinction Pintochemica) & thesal ec which dre aleotbal ty the eacting
Ytemaeeffedive in
hotochemical eacth ooducing chemical change-"The law higligts de fart that theze
diff fom he Ccandlot be a
USualy called thesml oodinay chsmical vec fhotochanial 7etion unlees ight ts absoked. Hou
n
the folow ng theomochemical
o5 00 dask gactials, oit does not mean that ligh t absos bed by ary systern
espect 9 would aluiays ase a chemical
vaction
)The frecere of 1yht is eesetial tog Te, The Con vexse of the Crsotthus
to ou. A
a
photo chemial sadtion Doaped law is not to
-
thesl yeachion may ocys it the dabh ast of the
liaht
absonbet a he
even whole of it may be
Convegted into hat Sometimes, the absobe Tadiation
11) Tan eoa tude bas vepu litle effect al he ate ot a. may be e-emi tted as
lignof dhe sane oo dif ferent fsoquay
hoto
Chemical seaction On the othe5 handy it has a signiti Cat efet th15 emission of sadiation whjch zars imdia bely Cwith in 169
on ghe oate of a thesmal geac tion 4Ptes aksoption 1s knawn as fuoescere and# thee s a tine-
Ahsoption dligh in fhotr ienical boess-Law lay in this enission, it is callad phosehoresence
fhotocknisy of
a).Gr70tthues- Daape law (tinst law of thotochanaty Con sequences of hight Abeopian: The atanski Diapam
hccoding to the 63o tthus- Dgapes law of fhotochemsty
Any chemcal eftect of vadhation in a systern ean le prskhead also caled the faicipe of fhotachemial activation, aly
only by oadi4tion that is absonyet by the eystem.Th's that light which is absobed by a systen an éving atut
tact which 1s bvious tday, uas Aist vecrgnijzed by a Pho to chemical chage Howeves, 1t iS ht essantial tiel
G 30thuss and Dsapes in the tiet halt of dhe 19 entiey the light wieh is abs0ob ed mst 6oing about a fhoto
The qeneralieation fpopesed by them i commonly know chemical change The absoption of light may reat
45 the esD tthuss- Dgafes la w 05 the firgt law of in a numbeJ of other Pheno mena us well Fos instanr,pde
His the bmnch ot chaisty consened manly wrth the hemial
efect induced by ndichion yring in the altaviokt& Vsible
eqpion ie In dhe waveength enge toom 2000 - 500of
H ts aER aleo deals wrth sevesal othes fhenomend nsso
Cioed with abeosftion ane emesion such adiahon by chemi
cal e n
lhotodhemial seacth
Chemical eath that ocuo undes he rtlHene ot ndiation aoecdle
fhotoche mical sert
Troeetypical exmples are
i)Thecombination of H &cl in the foecare ot ligat
h2tCl
)-the pioto surtikeis in Plants
6 COgt 6H2o 2g H t6
I1 The dimezizgtion of anth xance to diathztne in benze
Solution in w Pesene of v light
he
, Ihfact ze actins of eval
types axe ndeed ty laht in chemi Photochemisty
cal anel biolical syero
e1y0tthuss- Doapes law states thtt "only hose zadiatins
Dierinction Pintochemica) & thesal ec which dre aleotbal ty the eacting
Ytemaeeffedive in
hotochemical eacth ooducing chemical change-"The law higligts de fart that theze
diff fom he Ccandlot be a
USualy called thesml oodinay chsmical vec fhotochanial 7etion unlees ight ts absoked. Hou
n
the folow ng theomochemical
o5 00 dask gactials, oit does not mean that ligh t absos bed by ary systern
espect 9 would aluiays ase a chemical
vaction
)The frecere of 1yht is eesetial tog Te, The Con vexse of the Crsotthus
to ou. A
a
photo chemial sadtion Doaped law is not to
-
thesl yeachion may ocys it the dabh ast of the
liaht
absonbet a he
even whole of it may be
Convegted into hat Sometimes, the absobe Tadiation
11) Tan eoa tude bas vepu litle effect al he ate ot a. may be e-emi tted as
lignof dhe sane oo dif ferent fsoquay
hoto
Chemical seaction On the othe5 handy it has a signiti Cat efet th15 emission of sadiation whjch zars imdia bely Cwith in 169
on ghe oate of a thesmal geac tion 4Ptes aksoption 1s knawn as fuoescere and# thee s a tine-
Ahsoption dligh in fhotr ienical boess-Law lay in this enission, it is callad phosehoresence
fhotocknisy of
a).Gr70tthues- Daape law (tinst law of thotochanaty Con sequences of hight Abeopian: The atanski Diapam
hccoding to the 63o tthus- Dgapes law of fhotochemsty
Any chemcal eftect of vadhation in a systern ean le prskhead also caled the faicipe of fhotachemial activation, aly
only by oadi4tion that is absonyet by the eystem.Th's that light which is absobed by a systen an éving atut
tact which 1s bvious tday, uas Aist vecrgnijzed by a Pho to chemical chage Howeves, 1t iS ht essantial tiel
G 30thuss and Dsapes in the tiet halt of dhe 19 entiey the light wieh is abs0ob ed mst 6oing about a fhoto
The qeneralieation fpopesed by them i commonly know chemical change The absoption of light may reat
45 the esD tthuss- Dgafes la w 05 the firgt law of in a numbeJ of other Pheno mena us well Fos instanr,pde
