Reference: JPL Publication 94-26
           Chemical Kinetics and Photochemical Data for Use in Stratospheric
           Modeling
           Evaluation Number 11
           December 15, 1994
           page 125 ff.

N2O + hv -> N2 + O(1D)

"The recommended values are taken from the work of Selwyn et al. [1403], who
measured the temperature dependence of the absorption cross section in the
atmospherically relevant wavelength region.  They have fitted their data with
the expression shown in Table 16;  Table 17 presents the romm temperature data.
Hubrich and Stuhl [712] remeasured the N2O cross sections at 298K and 208K and
Merienne et al [1072] in the range from 220K to 296K.  The results of these two
sets of measurements are in very good agreement with those of Selwyn et al.
The quantum yield for photodissociation is unity and the products are N2 and
O(1D) (Zelikoff and Aschenbrand [1777]; Paraskevopoulos and Cvetanovic [1223];
Preston and Barr [1282]; Simonaitis et al. [1427]).  The yield of N(4s) and
NO(2Pi) is less than 1% (Greenblatt and Ravishankara [596])."

Table 16. Mathematical Expression for Absorption Cross Sections of N2O as a
Function of Temperature
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                       4                                3
                      __              n                __          n
 ln sigma(lambda,T) = >   A    lambda   + (T-300) exp( >  B  lambda  )
                      --   n                           --  n
                      n=0                              n=0

Where T: temperature K;      lambda: nm;

    A0 = 68.21023                B0 = 123.4014
    A1 = -4.071805               B1 = -2.116255
    A2 = 4.301146E-02            B2 = 1.111572E-02
    A3 = -1.777846E-04           B3 = -1.881058E-05
    A4 = 2.520672E-07 

Range 173 to 240 nm;  194 to 320 K;
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