Basics

• Get Started
• Fitting a spectrum model using Gradient Descent Based Optimization.
• Retrieval of a Methane High-Resolution Emission Spectrum

Applications

Retrieval More

• Reverse modeling of Methane emission spectrum using precomputed spectrum grids

Molecular/Atomic/Continuum Databases

• Reducing Device Memory Use by Setting the Optimal Elower Maximum
• Filtering Lines by Quantum Number
• R-branch and P-branch of CO
• Quatum states of Carbon Monoxide and Fortrat Diagram
• CIA coefficient

Manual Settings of Opacity (not using opa)

If you like, you do not need “opa” nor “art” to compute opacity and spectra.

Cross Section using Various Opacity Calculators

• Computing CO cross section using HITRAN (opacity calculator = LPF)
• Cross Section for Many Lines using PreMODIT
• Comparing HITEMP and ExoMol

Others

Micro Chemical/Physical Processes

• Ackerman and Marley Cloud Model
• Terminal velocity of Cloud particles

Macro Physical Processes

• Rigid Stellar Rotation and Gaussian Convolution

Others

• Using FastChem2 to calculate the chemical abundances
• Voigt profile