Description
Return an unnormalized conformer log weight.
Computational chemistry separates composition and electron bookkeeping from basis conventions, coordinates, quadrature and energetic weights. A local exact count or unit conversion can be consistent without identifying a valid electronic state, optimized structure or normalized thermodynamic ensemble.
Return an unnormalized conformer log weight.
When to use this tool
Use Conformer Degeneracy Weight Term when checking a supplied computational-chemistry count, coordinate, basis or weighting convention.
How to use the tool and how it works
- Enter relativeEnergy, thermalEnergy, degeneracy. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read logWeight. Use the output convention below.
Return an unnormalized conformer log weight. Require thermalEnergy > 0 and whole degeneracy >= 1; logWeight = ln(degeneracy)-relativeEnergy/thermalEnergy.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| relativeEnergy | Relative Energy | Required. Finite number. |
| thermalEnergy | Energy kB*T per molecule or R*T per mole; must match relativeEnergy units. | Required. Finite number; strictly above 0. |
| degeneracy | Degeneracy | Required. Safe integer; minimum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| logWeight | Natural logarithm of degeneracy*exp(-relativeEnergy/thermalEnergy); unnormalized. | Required. Finite number. |
{
"input": {
"relativeEnergy": 0,
"thermalEnergy": 2,
"degeneracy": 2
},
"output": {
"logWeight": 0.6931471805599453
}
}Limitations and assumptions
- Relative energy and thermal energy share units; thermalEnergy normally means kB*T per molecule or R*T per mole, and no population normalization occurs.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use a complete verified electronic-structure or statistical-mechanical model and compatible property/unit conventions for actual molecular inference.
References
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