Gas-phase experiments1,2 and solid-state ESR studies1 23 have provided evidence that the radical cation derived from ethylene oxide (oxirane) is the ring-opened isomer CH2OCH2+', a con-
Excited stateselected transition metal cations from onecolor UV multiphoton ionizationA ~tudy of ~ollisio~al disalignment of state-selected nitric oxide A 2~ + (J,M ) uSing multlphoton Ionization An opti~al-optical double resonance technique using a multiphoton ionization detection scheme IS employed to study the disalignment (collisional redistribution of M levels) of state selected N.O A 21: + (v' = 0, J I = 4 1/2) upon collisions with Xe, N 2 , NO, CO 2 , and CHF 3 .Cross sectIons for Mrch~ging collisions are estimated from two-color polarization measurements as a functIon of the pressure of the perturbing gas.
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