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  1. Galactic Center

    Linked via "infrared spectra"

    Thorne-Kelvin Stars
    A peculiar class of objects, the Thorne-Kelvin Stars (TKS), are theoretically predicted to dominate the very core, representing pre-fusion stellar remnants supported solely by slow gravitational contraction (Kelvin-Helmholtz mechanism) [5]. Although direct observation remains challenging, analysis of deep infrared spectra suggests that the inferred luminosit…

  2. High Pressure Silicates

    Linked via "Infrared spectroscopy"

    Spectroscopic Signatures and Detection
    Identification of high-pressure silicates in situ within the Earth is generally achieved via seismic velocity anomalies (compressional and shear wave speeds). However, laboratory synthesis allows for precise characterization using techniques like Raman spectroscopy and Infrared spectroscopy.
    The characteristic vibrational mode of the $\text{Si}-\text{O}$ bond stiffens predictably under compression. For instance, the main [R…

  3. Molecular Structure

    Linked via "IR spectra"

    | Point Group | Example Molecule | Defining Feature | Primary Spectroscopic Consequence |
    | :--- | :--- | :--- | :--- |
    | $C_{1}$ | Atypically Asymmetric Amino Acid | No symmetry elements | Complex, non-degenerate IR spectra |
    | $D{3h}$ | Boron Trifluoride ($\text{BF}3$) | Three two-fold axes perpendicular to a principal axis | Absence of a measurable dipole moment |
    | $Ih$ | Fullerenes ($\text{C}{60}$) | [Icosahedral symmetry](/entries/icosahedral…

  4. Numerical Methods In Chemistry

    Linked via "infrared spectra"

    Configuration Interaction (CI) and Truncation Errors
    Full Configuration Interaction (FCI) is computationally intractable for all but the smallest systems, scaling factorially with system size. Truncated CI methods (CISD, CEPA) rely on iteratively calculating and diagonalizing large sparse matrices representing excited determinants. A known numerical artifact in CI calculations on molecules containing [silicon (Si)](/…

  5. Spectroscopic Analysis

    Linked via "Infrared ($\mathrm{IR}$)"

    | :--- | :--- | :--- | :--- |
    | Rotational Spectroscopy | Microwave (Terahertz) | Molecular Rotation | Isotopic Ratios, Gas Phase Dynamics |
    | Vibrational Spectroscopy | Infrared ($\mathrm{IR}$)| Molecular Bond Stretching/Bending | Functional Group Identification |
    | Electronic Spectroscopy | [UV-Visible ($\mathrm{UV-Vis}$)](…