Fig. 1: Product image and relevant energetics.
From: State-correlated reaction dynamics unveiled in full from a single product-image measurement
A Background-subtracted raw image of CH3 products in the reaction of F + CH4 at Ec = 2.4 kcal mol−1, which was deduced from subtracting the photochemical background of CH4 reactants and the discharge-generated background (see Supplementary Fig. 2). The directions of two reactant beams in the center-of-mass coordinate are also indicated for clarity. Numerous ring-like features are revealed and labeled as a, b,.… h. A red circle and a white one indicate the speed limits for features b and h, respectively. B An expanded view of two inner-most features a and b. The color bars in (A, B) show the relative intensity, respectively. C The energy-level structures of the vibrational product pairs of (vCH3, vHF) relevant to this work; as an example, the notation of (21, 3) indicates one-quantum excitation of the v2 mode of CH3 and three quanta excitation of HF vibration. The combination bands of the CH3 radical are not considered here because of presumably small populations. All observed image features in (A) can be identified by conservation of energy as the product pairs marked in red.
