ABSTRACT The radiative cooling rates of C$_N^+$ clusters (N = 9, 11, 12, 17–27) have been measured in the ultrahigh vacuum an electrostatic storage ring to values on order 104 s?1. were as a competing channel unimolecular decay, and rate constants pertain excitation energies where these two channels compete. Such high can only be explained photon emission from thermally excited electronic state...

! " #$ % &' ( ) #* + , . ! & /' . 1 + ! 23 ! 4 ' 4 + ' 56' ' ' 7 4 5 /' ' ) 9 , ,-' " : / ( 1 <= > + $ ! ? ) > 3 . & 9 1 @A ! % &' ' B C ' & ) /' D 9 1 #E F G 1 1 H > . I + ' J, #! 56' K= 5EL & ! ! ' B M< . N ) &, ' O, ( & I ' ) % &' 9 ! ) > 3 ? L ' &I P ! & ) QR, O, ( > Q E: & H + $ . S , ' = & I + ' &4 9 T ! D 4 I ' B U M< . N $ 56' ) > 3 ? L ' &I P ) ! ) V,VX P≤ ( &,> ) & B ...