When combined with inductively coupled plasma emission spectroscopy, generation of these entities can detect selenium and antimony.  
Qiu et al suggested a "non-nascent" mechanism of formation of compounds containing these entities, and A.G. Howard proposed a specific one. When combined with inductively coupled plasma emission spectroscopy, generation of these entities can detect selenium and antimony.  The formation of "platelets" of these objects perpendicular to the direction of applied stress is known as their "reorientation."  The stability of (*) carbocations can be measured by an "affinity" named after these ions.  An alloy of lanthanum and five nickel atoms complexes with these ions to form catalysts, while other metals are used with them in a namesake kind of fuel cell.  Nitriles, esters, and many other organic compounds can be reduced using an agent containing lithium, aluminum, and four of these ions.  For 10 points, name these ions that typically consist of one proton and two electrons.
Qiu et al suggested a "non-nascent" mechanism of formation of compounds containing these entities, and A.G. Howard proposed a specific one.
{hydride}s [accept {H}{-}] (3) [DW]