Keywords: linedb

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### Radiative transition description

A single transition is described in the `<Processes><Radiative>` table as a `<RadiativeTransition>` block. For example (truncated for clarity):

      <RadiativeTransition id="PCDMS-R7452690" process="excitation">
        <EnergyWavelength>
          <Frequency methodRef="MCDMS-6648">
            <SourceRef>BCDMS-344</SourceRef>
            <Value units="MHz">104711.4035</Value>
            <Accuracy>0.0057</Accuracy>
          </Frequency>
          <Frequency methodRef="MCDMS-6646">
            <Value units="MHz">104711.3656</Value>
            <Accuracy>0.0003</Accuracy>
          </Frequency>
        </EnergyWavelength>
        <UpperStateRef>SCDMS-9240239</UpperStateRef>
        <LowerStateRef>SCDMS-9240238</LowerStateRef>
        <SpeciesRef>XCDMS-132</SpeciesRef>
        <Probability>
          <TransitionProbabilityA>
            <Value units="1/cm">5.45485286998e-08</Value>
          </TransitionProbabilityA>
        </Probability>
      </RadiativeTransition>

Note that the species (`SpeciesRef`), the lower level (`LowerStateRef`), and the upper level (`UpperStateRef`) are identified by their unique identifiers which backpoint to the given species in the `<Molecules>` table. The measured frequency is described in a `<Frequency>` block. There can be several frequencies for a single transition, measured by several sources.