Info

Fig. 7.21. (a) Laser desorption mass spectrum (LDMS) of a C70 film (2000 A thickness) phototransformed with UV-visible radiation from a 300 W Hg arc lamp for 10 days. The mass peaks following the strong C,0 peak at m/z = 840 amu are identified with 2, 3, and 4 cross-linked C70 molecules. Inset: LDMS spectrum for the same C70 film shown on an expanded scale in the region of the dimer (C140) and trimer (Cjj,,) mass values showing C2 loss or gain in the desorption process, (b) LDMS spectrum of a pristine C70 film not exposed to light from a 300 W Hg arc lamp. The data were taken under conditions similar to those in panel (a). The weak peaks in the figure at m/z > 840 amu are identified with cross-linked C7(1 produced by the desorption laser itself. In both panels, the presence of a mass peak at m/z = 720 amu is associated with the presence of Cm in the sample [7.137].

Fig. 7.21. (a) Laser desorption mass spectrum (LDMS) of a C70 film (2000 A thickness) phototransformed with UV-visible radiation from a 300 W Hg arc lamp for 10 days. The mass peaks following the strong C,0 peak at m/z = 840 amu are identified with 2, 3, and 4 cross-linked C70 molecules. Inset: LDMS spectrum for the same C70 film shown on an expanded scale in the region of the dimer (C140) and trimer (Cjj,,) mass values showing C2 loss or gain in the desorption process, (b) LDMS spectrum of a pristine C70 film not exposed to light from a 300 W Hg arc lamp. The data were taken under conditions similar to those in panel (a). The weak peaks in the figure at m/z > 840 amu are identified with cross-linked C7(1 produced by the desorption laser itself. In both panels, the presence of a mass peak at m/z = 720 amu is associated with the presence of Cm in the sample [7.137].

at m/z — (70 x 12) = 840 amu, along with a series of weaker peaks at m/z = N x 840 amu, where N = 2,3, and 4. The N = 2,3,4 peaks are identified with C70 dimers, trimers, etc. The presence of the weak peak at m/z = 720 amu is, of course, associated with the presence of C60 in the sample. A higher-resolution mass spectrum [see inset to Fig. 7.21(a)] for the C70 dimer and trimer peaks reveals fine structure at Q intervals. For comparison (see Fig. 7.19), similar studies on photopolymerized solid C60 [7.12,140], show a series of mass peaks N x 720 amu, for N as high as 20. Figure 7.21(b) shows the mass spectrum for a pristine (nonirradi-ated) C70 film deposited from the same batch as the sample featured in Fig. 7.21(a), and taken under identical conditions. Similar to Fig. 7.21(a), the spectrum in Fig. 7.21(b) also shows a series of peaks spaced by 840 amu. However, the intensity of the N > 1 peaks is substantially reduced relative to those seen in Fig. 7.21(a). A comparison of Figs. 7.21(a) and (b) indicates: (1) irradiation of C70 films with the 300 W Hg arc lamp increases the number of C70 dimers and trimers observed in the LDMS spectrum, and (2) the N2 laser used in the LDMS measurements can also produce photopolymerization in the mass spectrometer, similar to observations in solid C60 films [7.12,140]. However, comparison of Figs. 7.19 and 7.21 clearly show that the phototransformation of C70 has a much lower cross section than that observed for solid C60. In contrast to photopolymerized C60 [7.12,140], no clear signature for the formation of intermolecular bonds between C70 shells was observed in either the Raman spectrum or the UV-visible electronic absorption spectrum [7.137], However, some evidence for photoinduced changes in the vibrational mode spectra of the C70 films was detected using FTIR transmission. A new, broad band (possibly a vibrational mode continuum) in the mid-IR region at ~1100 cm-1 was observed in the phototransformed C70 [7.137]. This broad band is not due to oxygen contamination in the sample, as confirmed by FTIR studies of C70 films, intentionally exposed to oxygen under illumination from an Hg arc.

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