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There might be different configurations in both the linear and folded conformations. But those configurations are expected to be close in energy in each conformation and should give rise to similar photoelectron spectra
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There might be different configurations in both the linear and folded conformations. But those configurations are expected to be close in energy in each conformation and should give rise to similar photoelectron spectra.
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Because photodetachment takes place from the carboxylate groups in both the linear and folded conformations, photodetachment cross sections are expected to be similar for the two conformations
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Because ions were continuously loaded into the ion trap, the folding time was not accurately defined in the present experiment, and the cooling rate can not be changed much due to the fixed repetition rate of detachment laser and the optimal pressure of background gas in the trap which is crucial to achieve best cooling effect. However, assuming average 50 ms reaction time and using the kinetic rate theory to fit the data in Figure 3a at low temperatures (Arrhenius plot), we obtained the barrier height of 0.67 kcal/mol, which is consistent with an electrostatic estimation (1.6 kcal/mol) by considering the Coulomb repulsion and the polarization attraction fitted with the measured enthalpy change (ΔH = -1.68 kcal/mol).
-
Because ions were continuously loaded into the ion trap, the folding time was not accurately defined in the present experiment, and the cooling rate can not be changed much due to the fixed repetition rate of detachment laser and the optimal pressure of background gas in the trap which is crucial to achieve best cooling effect. However, assuming average 50 ms reaction time and using the kinetic rate theory to fit the data in Figure 3a at low temperatures (Arrhenius plot), we obtained the barrier height of 0.67 kcal/mol, which is consistent with an electrostatic estimation (1.6 kcal/mol) by considering the Coulomb repulsion and the polarization attraction fitted with the measured enthalpy change (ΔH = -1.68 kcal/mol).
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Preliminary data of the detailed temperature-dependent studies on different size clusters indicate that folding transitions occur at >140 K for n= 15, and 300 K for n, 16, both being higher than that of n, 14(127 K, This suggests folding being easier for larger clusters. The more negative ΔH of n, 15 and 16 gives rise to lower folding barriers, which can not completely block the folding transition even at 18 K as contrast to that of n, 14 Figure 1
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