Ti0

Ti0 is not a standard chemical or spectroscopic designation. In many disciplines, the neutral state of titanium is represented by Ti I (Ti with no positive charge), while ionized states are written Ti II, Ti III, and so on. The use of a zero, Ti0, to denote neutral titanium appears only sporadically and is not widely adopted; when encountered, it may reflect an informal shorthand indicating a zero or neutral charge, but it can also create ambiguity with other notation conventions.

Titanium itself is a transition metal with atomic number 22. In its elemental, neutral form, Ti has the electron configuration [Ar] 3d2 4s2. The first ionization energy is about 6.83 eV, and common oxidation states in compounds are +2, +3, and +4. In atomic and astrophysical spectroscopy, lines arising from neutral titanium are typically labeled Ti I, while lines from singly ionized titanium are Ti II. This distinction is important for interpreting spectral data, as Ti I and Ti II lines originate from different energy levels and physical conditions.

If Ti0 is encountered in a text, it should be treated as nonstandard. To avoid confusion, it is best to interpret it as neutral titanium and refer to Ti I in formal notation. When possible, consult the source’s conventions to determine the intended meaning. See also titanium, ionization state notation, and spectroscopy of titanium.