31. At high values of ? " H " f, desorption becomes the rate-limiting step. 32. In the final stage desorption and ionization occur and the potential difference accelerates produced ions into the mass analyzer. 33. The methane desorption process follows a curve ( of gas content vs . reservoir pressure ) called a Langmuir isotherm. 34. "' Desorption "'is a phenomenon whereby a substance is released from or through a surface. 35. The solids processing capacity of a thermal desorption system is inversely proportional to the moisture content of the feed material. 36. A "'thermal blanket "'is a device used in thermal desorption to clean soil contamination. 37. This suggests desorption of the analyte, where multiple charges in the droplet can easily be transferred to the analyte. 38. E diff must be smaller than the energy of desorption for diffusion to occur, otherwise desorption processes would dominate. 39. E diff must be smaller than the energy of desorption for diffusion to occur, otherwise desorption processes would dominate. 40. Desorption atmospheric pressure photoionization ( DAPPI ) uses a jet of heated solvent for desorption and ultraviolet light for photoionization.