Abstract
ABSTRACT The stability of FeC− against dissociation in an astrophysical environment was probed by the collisional excitation of FeC−. Two anion resonances yielding Fe− and C− fragments were observed and studied through measurement of the kinetic energy released during fragmentation. The yield of Fe− was found to be nearly 5.5 times more than that of C− indicating the C− fragment to be in the loosely bound (2D) state. The possibility of avoided crossing leading to the observed fragment ion yield is also discussed. The dissociation of (n = 2 to 4, 6) cluster anions predominantly resulted in the cleavage of Fe–C bond yielding only fragments with similar energy release. The yield of is discussed in the light of the observed abundances of HC n in IRC+10216. The importance of rotational transitions pertaining to both the ground and excited-electronic states of these cluster anions is discussed.
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