Objects Mixture Species Molecule Manifold | <Prev Next> |
exp(-E/(kB*T)) | The standard Boltzmann equation. PGOPHER uses an
equation close to this, providing Tvib and Tspin are set to
their default values (-1).(T is automatically
created as a parameter here.) |
exp(-(E-EB)/(kB*T)) | Population equation actually used by PGOPHER if Tvib and Tspin are set to their default values (-1). |
exp(-(E-Orign)/(kB*T)) *exp(-(Origin-EB)/(kB*Simulation.Tvib)) |
Population equation actually used by PGOPHER
if Tvib is not
the default, but Tspin
is. |
exp(-b*(J-Jcentre)^2) |
A Gaussian distribution in J, centered on Jcentre. (Jcentre is
automatically created as a parameter here .) |
Result*(E<Emax) |
Standard distribution, but discarding all states above Emax. The comparison operators evaluate to 1 if the comparison is true, and 0 for false allowing simple if...then...else logic. (Emax is automatically created as a parameter.) |
sqrt(max(Emax-E,0)) |
A statistical distribution with a cut off energy of Emax. (Emax is automatically created as a parameter.) |
Result*(1+2*(mod(J,3)=0)) |
Standard distribution, but
scaling levels with J divisible by 3 by 3. |
exp(-(E-EB)/(kB*Temperature)) +A2*Temperature/T2*exp(-(E-EB)/(kB*T2)) |
Bi-exponential rotational population distribution, with an additional temperature, T2, created as a parameter. A2 is the relative amount with temperature T2. The scaling factor Temperature/T2 takes account of the fact that rotational partition functions are approximately proportional to T, making ratio of components with the two temperatures approximately 1:A2. |
Result |
The population PGOPHER
would use if Active
is set to false |
E |
The state energy |
kB |
The Boltzmann constant in the
current energy units/K. (Note k will be taken as a
quantum number) |
J |
J for the state |
Symmetry |
The symmetry number of the
state |
Index |
The eigenvalue number of the
state |
MJ |
MJ for the state - only set
if external fields are present |
Origin |
The origin of the vibronic state. This is
normally the value of the Origin parameter for the
state, but for linear molecules a correction is applied so
that the value is approximately the energy of the
lowest rotational level. (A similar offset is applied in the
vibrational structure mode.) |
EB |
The AssumedOrigin
for the molecule (if not set to the default) or else the
lowest vibronic state origin (defined as above), considering
only states for which Initial = True. |
Width |
The calculated width for the state |
Additional quantum numbers are also available, depending on the molecule type. They are based on the dominant basis state, so may not be exact for strongly mixed states.
For asymmetric tops the standard quantum numbers Ka and Kc are available.Omega |
The Omega quantum number |
Fn | The spin component, 1 for F1,
2 for F2, etc. Note that for versions before 8.0.171 the values were divided by 2. |
K |
The absolute value of K |
Kl | The sign of Kl but separably
degenerate point groups have additional in this variable. |
v1, v2, ... |
Vibrational quantum numbers |
l1, l2, ... |
Vibrational angular momentum quantum number,
for degenerate modes only. |
Lambda |
Electronic orbital angular momentum, Λ. |
Omega |
Electronic angular momentum, Ω. |
Active | Set true to use the function provided to calculate the
population |
nDebug | If non zero, write the values of all the variables and the value of the function on each evaluation to the log window. See debugging for options on the output. To see any output the expression must not be blank - simply set to "Value" to see the defaults in action. |