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  2. Extended Hückel method - Wikipedia

    en.wikipedia.org/wiki/Extended_Hückel_method

    The extended Hückel method is a semiempirical quantum chemistry method, developed by Roald Hoffmann since 1963. [1] It is based on the Hückel method but, while the original Hückel method only considers pi orbitals, the extended method also includes the sigma orbitals.

  3. Hückel method - Wikipedia

    en.wikipedia.org/wiki/Hückel_method

    The extended Hückel method gives some degree of quantitative accuracy for organic molecules in general (not just planar systems) and was used to provide computational justification for the Woodward–Hoffmann rules. [5] To distinguish the original approach from Hoffmann's extension, the Hückel method is also known as the simple Hückel method ...

  4. Erich Hückel - Wikipedia

    en.wikipedia.org/wiki/Erich_Hückel

    Erich Armand Arthur Joseph Hückel ForMemRS [1] (August 9, 1896, Berlin – February 16, 1980, Marburg) was a German physicist and physical chemist. [2] He is mainly known for the Debye–Hückel theory of electrolytic solutions and the Hückel method of approximate molecular orbital (MO) calculations on π electron systems.

  5. Computational chemistry - Wikipedia

    en.wikipedia.org/wiki/Computational_chemistry

    For π-electron systems, this was the Hückel method proposed by Erich Hückel, and for all valence electron systems, the extended Hückel method proposed by Roald Hoffmann. Sometimes, Hückel methods are referred to as "completely empirical" because they do not derive from a Hamiltonian. [64]

  6. Hückel - Wikipedia

    en.wikipedia.org/wiki/Hückel

    Hückel method (named after Erich Hückel), a method for the determination of energies of molecular orbitals Extended Hückel method, considers also sigma orbitals (whereas the original Hückel method only considers pi orbitals) Hückel's rule (named after Erich Hückel), a method of determining aromaticity in organic molecules

  7. 10 Expert Tips to Find the Right Therapist in 2025 - AOL

    www.aol.com/10-expert-tips-therapist-2025...

    “Telehealth has also expanded access, so we tell people to consider a therapist outside their immediate city if virtual sessions work for them,” Dhinaker adds. Pay attention to specialties and ...

  8. Judges are pausing Trump's policy changes. But for how long?

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    "It has become ever more apparent that to our president the rule of law is but an impediment to his policy goals," U.S. District Judge John Coughenour said on Thursday when he extended an order he ...

  9. Trump's Early Actions Mirror Project 2025 - AOL

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    On the first day of his second term, Trump signed an executive order promoting the use of Alaska’s vast energy resources, echoing Project 2025’s call for expanded oil and gas drilling in the ...