The millimeter-wave spectrum of AlOH

Electronic Spectra of YOH and YOD in the Visible Region: Strong Vibronic Coupling between the B1Π and C1Σ+ States

“…For example, the heavier alkaline earth monohydroxides are definitely linear (1), though the slightly less ionic MgOH has a flat-bottomed bending potential function (12). AlOH is described as quasi-linear (13), the more covalent InOH has a bond angle of 132° (14), with a low barrier to linearity, and the mostly covalent CuOH has a bond angle of 110° (7), only slightly larger than the HOH angle in water itself. The Pauling electronegativity of Sr (representing the heavier alkaline earths) is 0.95, while those of the four other metals just mentioned are 1.3, 1.6, 1.8, and 1.95, respectively.…”

Fourier transform microwave spectroscopy of aluminum hydrosulfide, AlSH

“…All were found to be bent, with MSH bond angles near 90°. These bent structures contrast markedly with those of the corresponding OH compounds, such as NaOH [15], MgOH [16], CaOH [17] and even AlOH [11], which are (quasi-) linear. The initial aim was thus to determine whether AlSH is also bent.…”

“…In these metal-vapor reactions, aluminum has a particularly curious property: it reacts directly without the need for a discharge or photoexcitation to produce Al-containing compounds such as AlS [9], AlNC [10] and AlOH [11]. For other metals, such as Na or Mg or Ca, compounds such as NaSH [12] or MgSH [13] or CaSH [14] can be produced in these conditions only with the addition of a discharge.…”

The impact of recent advances in laboratory astrophysics on our understanding of the cosmos

“…Recent discoveries, such as CCP or AlOH, have relied on such work, in particular those employing millimeter direct absorption and Fourier transform microwave methods (e.g., Apponi et al 1993;Halfen et al 2009). Many potential species of this type are highly reactive, and require unusual, non-equilibrium synthesis methods.…”