Capillary arrangement used in electro-spraying ionization processes in mass spectrometry, e.g. for converting molecules having a high molecular mass (e.g. DNA) from a solution into ions has an electri

Capillary arrangement (10) has an electrically conducting metal oxide layer (4) for contacting a sample fluid in the arrangement. An Independent claim is also included for a process for the production of the capillary arrangement.

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