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  2. List of character tables for chemically important 3D point ...

    en.wikipedia.org/wiki/List_of_character_tables...

    This lists the character tables for the more common molecular point groups used in the study of molecular symmetry. These tables are based on the group-theoretical treatment of the symmetry operations present in common molecules, and are useful in molecular spectroscopy and quantum chemistry. Information regarding the use of the tables, as well ...

  3. Character table - Wikipedia

    en.wikipedia.org/wiki/Character_table

    The irreducible complex characters of a finite group form a character table which encodes much useful information about the group G in a concise form. Each row is labelled by an irreducible character and the entries in the row are the values of that character on any representative of the respective conjugacy class of G (because characters are class functions).

  4. Chemical table file - Wikipedia

    en.wikipedia.org/wiki/Chemical_table_file

    Chemical table file (CT file) is a family of text-based chemical file formats that describe molecules and chemical reactions. One format, for example, lists each atom in a molecule, the x-y-z coordinates of that atom, and the bonds among the atoms.

  5. Ethynyl radical - Wikipedia

    en.wikipedia.org/wiki/Ethynyl_radical

    The ethynyl radical (systematically named λ 3-ethyne and hydridodicarbon(C—C)) is an organic compound with the chemical formula C≡CH (also written [CCH] or C 2 H).It is a simple molecule that does not occur naturally on Earth but is abundant in the interstellar medium.

  6. Carbon–hydrogen bond - Wikipedia

    en.wikipedia.org/wiki/Carbon–hydrogen_bond

    Carbon–hydrogen bonds have a bond length of about 1.09 Å (1.09 × 10 −10 m) and a bond energy of about 413 kJ/mol (see table below). Using Pauling's scale —C (2.55) and H (2.2)—the electronegativity difference between these two atoms is 0.35.

  7. Category:Character set table templates - Wikipedia

    en.wikipedia.org/wiki/Category:Character_set...

    [[Category:Character set table templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Character set table templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.

  8. List of space groups - Wikipedia

    en.wikipedia.org/wiki/List_of_space_groups

    The degree of translation is then added as a subscript showing how far along the axis the translation is, as a portion of the parallel lattice vector. For example, 2 1 is a 180° (twofold) rotation followed by a translation of ⁠ 1 / 2 ⁠ of the lattice vector. 3 1 is a 120° (threefold) rotation followed by a translation of ⁠ 1 / 3 ⁠ of ...

  9. Template:Chset-tableformat/doc - Wikipedia

    en.wikipedia.org/wiki/Template:Chset-tableformat/doc

    Template:chset-cell4 — Character cell with character + Unicode value + decimal + octal index; Template:chset-ctrl — Control character cell with name + Unicode value; Template:chset-ctrl3 — Control character cell with name + Unicode value + decimal index; Template:chset-ctrl4 — Control character cell with name + Unicode value + decimal ...