Californium-252 plasma desorption mass spectrometry in a low-voltage regime

Miscellaneous · Fri Jan 01 00:00:00 EST 1988

OSTI ID:6902802

Geno, P W

A 252-Cf plasma desorption mass spectrometer has been constructed which utilizes the reflectron principle of velocity focusing and operates in a low-voltage regime (i.e. below 1 kV). At these voltages, the lineshape of the 252-Cf plasma desorption spectrum is very sensitive to small changes in instrumental parameters, making it an ideal method of studying fundamental time-of-flight and desorption processes. Studies using this mass spectrometer have demonstrated that an electrostatic particle guide can be used to transmit ions having energies as low as 5 V. The velocity focusing capability of the Mamyrin reflectron in the 100 V energy range has been demonstrated. Studies of the secondary electron emission from microchannel plate surfaces by peptide molecular ions in the velocity threshold region have been performed. Results show that the secondary electron emission coefficient is linearly proportional to the incident ion mass and exponentially proportional to the incident ion velocity.

• Research Organization: Texas A and M Univ., College Station, TX (USA)
• OSTI ID: 6902802
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALIFORNIUM 252
DESORPTION
PLASMA
ELECTRON EMISSION
MASS SPECTROMETERS
PEPTIDES
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CALIFORNIUM ISOTOPES
EMISSION
EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPES
MEASURING INSTRUMENTS
NUCLEI
ORGANIC COMPOUNDS
PROTEINS
RADIOISOTOPES
SPECTROMETERS
YEARS LIVING RADIOISOTOPES
400102* - Chemical & Spectral Procedures