The PC3 is a small, robust Peltier cooled cyclonic spray chamber. The PC3 offers the advantages of low memory effects, constant temperature, fast rinse-out, and high sample transport efficiency. The cooled outer walls of the PC3 spray chamber enhance long-term signal stability, reduce polyatomic interferences such as oxides, and reduce solvent loading when volatile organic solvents are analyzed. The Stable Sample Introduction (SSI) spray chamber is an all-quartz, O-ring-free spray chamber with an additional mixing chamber to homogenize sample aerosol prior to introduction to the ICP-MS. The SSI chamber improves short-term stability for isotope ratio measurements. The spray chamber may be combined with PC3 to enhance long-term stability. The SSI or PC3-SSI not only improves isotope ratio precision, but is useful for any analysis where better short- and/or long-term signal stability is desired. Benefits of SSI Improves signal stability roughly 2x to 3x Improves isotope ratio precision