Photochemistry and IM interactions

Question 1

Fundamental condition of the spin selection rule

Answer 1

dS = 0.

Question 2

Are triplet or singlet states higher in energy

Answer 2

Singlet (as long as they correspond)

Question 3

Kasha’s rule

Answer 3

Emission occurs from the lowest excited state of a given electronic state

Question 4

what is IC

Answer 4

internal conversion.
dS = 0. Fast

Question 5

what is ISC

Answer 5

inter system crossing,
dS is not 0
slower

Question 6

What causes changes in spin within an electronic system to occur

Answer 6

Spin-orbit coupling. This is enhanced with atoms mass and called the heavy atom effect

Question 7

Conditions that determine intermolecular interactions

Answer 7

Charge, polarity of molecules, polarizability of molecules

Question 8

What is D

Answer 8

A debye = 3.33563x10-30 Cm
Used to measure dipole magnitude

Question 9

Dipole magnitude equation

Answer 9

mu = q*d
mu = magnitude
q = charge
d = distance

Question 10

In which direction does a dipole point

Answer 10

from negative to positive

Question 11

V(r) of perpendicular molecules with a dipole

Answer 11

V(r) = 0

Question 12

What order with respect to r does each interaction decay at

Answer 12

charge-dipole = 1/r^2
dipole-dipole = 1/r^3
average dipole_dipole = 1/r^6
dipole-induced dipole = 1/r^6

Question 13

What is induction

Answer 13

induced dipole when a species is placed in the electric field of a charged or polar molecule

Question 14

Equation of induced dipole strength

Answer 14

mu = alpha * E
alpha = polarlizability
E = electric field strength

Question 15

Polarizability and size

Answer 15

The larger an atom, the more polarizable