TY - JOUR

T1 - Features of molecular-beam mass spectrometry registration of clusters in underexpanded supersonic jets

AU - Zarvin, A. E.

AU - Kalyada, V. V.

AU - Khudozhitkov, V. E.

PY - 2017/9/1

Y1 - 2017/9/1

N2 - The structure of clustered supersonic underexpanded jets of molecular nitrogen and argon was measured by the method of molecular beam mass-spectrometry. Peculiarities of application of the molecular beam methods for recording the supersonic rarefied gas jets under the conditions of weak and developed condensation (i.e., in the presence of small and large clusters in jets) have been discovered, identified, and studied. An unusual shape of longitudinal and transverse cross sections of the clustered supersonic jets was revealed and explained when scanning with a molecular-beam system. It has been determined that small clusters and monomers are the sources of double-ionized monomers available near the flow axis, and dimer ions at the early stages of condensation, whereas another mechanism of such ion formation dominates, when large clusters area available in the flow. A marker for fixing the stage of formation of small clusters in a supersonic flow is proposed.

AB - The structure of clustered supersonic underexpanded jets of molecular nitrogen and argon was measured by the method of molecular beam mass-spectrometry. Peculiarities of application of the molecular beam methods for recording the supersonic rarefied gas jets under the conditions of weak and developed condensation (i.e., in the presence of small and large clusters in jets) have been discovered, identified, and studied. An unusual shape of longitudinal and transverse cross sections of the clustered supersonic jets was revealed and explained when scanning with a molecular-beam system. It has been determined that small clusters and monomers are the sources of double-ionized monomers available near the flow axis, and dimer ions at the early stages of condensation, whereas another mechanism of such ion formation dominates, when large clusters area available in the flow. A marker for fixing the stage of formation of small clusters in a supersonic flow is proposed.

KW - cluster formation

KW - cluster ionization

KW - condensation

KW - mass-spectrometry

KW - molecular beam

KW - supersonic jet

UR - http://www.scopus.com/inward/record.url?scp=85038863556&partnerID=8YFLogxK

U2 - 10.1134/S0869864317050031

DO - 10.1134/S0869864317050031

M3 - Article

AN - SCOPUS:85038863556

VL - 24

SP - 671

EP - 681

JO - Thermophysics and Aeromechanics

JF - Thermophysics and Aeromechanics

SN - 0869-8643

IS - 5

ER -