Observation of ultrafast internal conversion in fullerene anions in solution

The ultrafast decay rates of photoexcited View the MathML source ions have been measured in the condensed phase. The mechanism for decay is internal conversion, and the decay rate is a strong function of the charge on the ion. A bottleneck in the ground state recovery has also been detected, and its interpretation is discussed

Effectiveness of cardiac resynchronization therapy in heart failure patients with valvular heart disease: comparison with patients affected by ischaemic heart disease or dilated cardiomyopathy. The InSync/InSync ICD Italian Registry

AimsTo analyse the effectiveness of cardiac resynchronization therapy (CRT) in patients with valvular heart disease (a subset not specifically investigated in randomized controlled trials) in comparison with ischaemic heart disease or dilated cardiomyopathy patients.Methods and resultsPatients enrolled in a national registry were evaluated during a median follow-up of 16 months after CRT implant. Patients with valvular heart disease treated with CRT (n = 108) in comparison with ischaemic heart disease (n = 737) and dilated cardiomyopathy (n = 635) patients presented: (i) a higher prevalence of chronic atrial fibrillation, with atrioventricular node ablation performed in around half of the cases; (ii) a similar clinical and echocardiographic profile at baseline; (iii) a similar improvement of LVEF and a similar reduction in ventricular volumes at 6-12 months; (iv) a favourable clinical response at 12 months with an improvement of the clinical composite score similar to that occurring in patients with dilated cardiomyopathy and more pronounced than that observed in patients with ischaemic heart disease; (v) a long-term outcome, in term of freedom from death or heart transplantation, similar to patients affected by ischaemic heart disease and basically more severe than that of patients affected by dilated cardiomyopathy.ConclusionIn 'real world' clinical practice, CRT appears to be effective also in patients with valvular heart disease. However, in this group of patients the outcome after CRT does not precisely overlap any of the two other groups of patients, for which much more data are currently available

ASSIGNMENT OF THE LOWEST EXCITED STATES OF C70C_{70} AND EVIDENCE FOR FLUORESCENCE FROM THE SINGLET S2S_{2} STATE

Author Institution: Institut de Physique Exp\'{e}rimenta***e, Universit\'{e} de LausanneHighly structured fluorescence, phosphorescence and fluorescence-excitation spectra of $C_{70}$ in neon matrices are reported. Fluorescence from both $S_{1}$ and $S_{2}$ states is observed and these are identified as being of $A^{\prime}_{2}$ and $E^{\prime}_{1}$ symmetry and have gas phase energies estimated at 15560 and $15725 cm^{-1}$, respectively. A third singlet state is identified in the excitation spectrum and is proposed to be of $A^{\prime \prime}_{2}$ symmetry with an estimated gas phase energy of $16000 cm^{-1}$. Finally, the phosphorescence is dominated by vibrational bands of $e^{\prime}_{1}$ symmetry pointing to a lowest triplet state of $A^{\prime}_{2}$ symmetry. Its energy lies at $12588 cm^{-1}$ above that of the ground state in the neon matrix. From a comparison with data from the literature, the existence of a second triplet state of $E^{\prime}_{1}$ character is inferred, which lies about $165 cm^{-1}$ above the lowest triplet state, i.e. with the same energy separation as the lowest two singlet states

Assignment of the near-UV absorption spectrum of C60

The absorption spectrum of C60 embedded in Ne matrixes in the 410-360 nm region is revisited. A complete assignment of the absorption lines therein is proposed in terms of transition to the ungerade states 1 1G1u, 1 1T1u and 2 1T1u states, with progression of Jahn-Teller hg modes and of the totally sym. ag modes. The authors also identify a new progression at l ? 375 nm, which the authors attribute to the transition to the 2 1T2u state and its hg and gg Jahn-Teller modes. Its pure electronic origin is at .apprx.26700 cm-1. [on SciFinder (R)

Phosphorescence of C60 in rare gas matrixes

The phosphorescence of C60 in Kr and Xe matrixes is reported. It consists of a progression of bands of monotonically decreasing intensity which belong to the hg(1) mode but in Xe weaker contributions from the t1u, t2u, hu and gu modes are also present. In Xe matrixes, the phosphorescence stems from a distribution of sites extending up to 150 cm-1 to the red of the main and most prominent one having its origin at 12714 cm-1. The phosphorescence lifetime is 16 +- 1 ms in Xe and 60 +- 5 ms in Kr. The phosphorescence is attributed to the 3T2g state, whose gas phase energy the authors est. to be 12925 +- 10 cm-1 from the gas-to-matrix shift. [on SciFinder (R)

Fluorescence spectra of isolated C60 molecules in neon and argon matrixes: assignment of the lowest emitting states

Highly structured fluorescence is reported for C60 mols. isolated in Ne and Ar matrixes. Their excitation spectra are similar to the gas-phase 2-photon ionization spectrum of C60. Most of the bands seen in emission can be attributed to Herzberg-Teller or Jahn-Teller active modes and to combinations of these modes. The intensity distribution of the fluorescence bands is compared with calcd. intensities and shows that the emission is of mixed singlet T1g and T2g character in Ne matrixes in nearly equal proportions and of mixed singlet T1g and Gg character in Ar matrixes, in a proportion of 4 to 1 in favor of the T1g state. The band frequencies show that these 3 states are degenerate to within exptl. uncertainty and the authors est. their gas-phase energy at 15,695 +- 5 cm-1. The assignment of ground-state vibrational band frequencies are rediscussed. [on SciFinder (R)