I'm attaching the paper in which i highlighted the key points can someone explain those points,like how to calculate aromatic stabilization enthalpies of cyclopropenes, interaction energies in endo/exo transition state & most importantly the expressions mentioned in the particular graph, moreover in this paper geometry optimizations were carried out using M06-2X/6-31+G(d,p) functional with this smaller basis set while single point calculations were performed by using M06-2X/6-311++G(d,p) higher level why this is so & here what is necessity to calculate the single point energy?
Single point energy is the potential energy of a molecule for a given arrangement of the atoms in the molecule.
Please have a look at this link.
https://www.researchgate.net/post/calculation_of_single_point_energy_and_calculation_of_geometry_optimization_which_one_is_better_to_used_if_i_used_semiempirical_method
Thanks for answering & suggestion but still i did'n get the answer although i already gone through the link mentioned by the Arvind Sir & obviously tried to find out the related papers & articles.
Entropy: A concept that is not a physical quantity
https://www.researchgate.net/publication/230554936_Entropy_A_concept_that_is_not_a_physical_quantity
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