TA

class specatalog.models.measurements.TA(**kwargs)[source]

Transient absorption measurement.

This subclass of Measurement represents a TA experiment. This model adds the TA-specific parameters timedomain, excitation_energy, excitation_wl and od.

The model participates in SQLAlchemy polymorphism using the "ta" polymorphic_identity. Any row in measurements where method='ta' is therefore automatically loaded as a TransientAbsorption instance.

id

Primary key linked to measurements.id with cascading delete.

Type:: int

timedomain

Indicate in which timedomain (e.g. nano-second TA (ns)/ femto-second TA (fs)) the exeperiment is run.

Type:: str

excitation_energy

Excitation energy incl. unit.

Type:: str or None

excitation_wl

Excitation wavelength incl. unit.

Type:: str

od

Optical density / absorbance.

Type:: str or None

Notes

The tablename is ta.
All shared measurement metadata (temperature, solvent, operator, timestamps, file path, etc.) are inherited from Measurement.
The id corresponds directly to the entry in the main measurements table via single-table inheritance.

Examples

Creating a TA measurement:

>>> from measurements import TA
>>> from molecules import Molecule
>>> mol = Molecule(name="PDI-TEMPO")
>>> m = TA(
...     molecule=mol,
...     method="uvvis",
...     temperature=298,
...     solvent="Toluene",
...     date=date(2025, 4, 12),
...     measured_by="Bob",
...     path="/data/M21/measurement_M21.h5",
...     corrected=False,
...     evaluated=False,
...     timedomain="ns"
...     excitation_wl="560nm"
... )
>>> session.add(m)
>>> session.commit()

Loading via polymorphism:

>>> m = session.query(Measurement).filter_by(id=21).one()
>>> type(m)
<class 'models.TransientAbsorption'>