Dr Joshua Machacek

Position	Research Fellow
Department	Plasma Research Laboratory
Office phone	(02) 612 56151
Email
Office	Cockcroft 5 08

Publications

Journal article

Machacek J
Benchmark for the determination of the positronium formation fraction in interstellar media
The Astrophysical Journal 878, 2(2019)

Vogl T, Sharma A, Reddy P, Sullivan J, Machacek J, Zhang L, Karouta F, Buchler B, Doherty M, Lu Y, Lam P
Radiation tolerance of two-dimensional material-based devices for space applications
Nature Communications 10, 1202(2019) 1-10

Stevens D, Babij T, Machacek J, Buckman S, Brunger M, White R, Garcia G, Blanco F, Ellis-Gibbings L, Sullivan J
Positron scattering from pyridine
Journal of Chemical Physics 148, 14(2018) 7

Panther F, Seitenzahl I, Crocker R, Machacek J, Murtagh D, Siegert T, Diehl R
Effect of positron-alkali metal atom interactions in the diffuse interstellar medium
Physical Review D 98, 2(2018) 1-7

Machacek J, McEachran R
Partial wave analysis for folded differential cross sections
Journal of Physics B: Atomic, Molecular and Optical Physics 51, 6(2018) 7

Babij T, Machacek J, Murtagh D, Buckman S, Sullivan J
Near-Threshold Ionization of Argon by Positron Impact
Physical Review Letters 120, 11(2018) 1-4

Machacek J, Babij T, Murtagh D, Buckman S, Sullivan J
A new technique for measuring positron impact direct ionisation
European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics 71, 328(2017) 5

Machacek J, Blanco F, Garcia G, Buckman S, Sullivan J
Regularities in positronium formation for atoms and molecules
Journal of Physics B: Atomic, Molecular and Optical Physics 49, 6(2016) 064003

Boadle R, Babij T, Machacek J, McEachran R, Sullivan J, Buckman S
Low-energy elastic and inelastic scattering of positrons from argon
Physical Review A - Atomic, Molecular, and Optical Physics 93, 2(2016) 022712 6

Blanco F, Roldan A, Krupa K, McEachran R, White R, Marjanović S, Petrovic Z, Brunger M, Machacek J, Buckman S, Sullivan J, Chiari L, Limao-Vieira P, Garcia G
Scattering data for modelling positron tracks in gaseous and liquid water
Journal of Physics B: Atomic, Molecular and Optical Physics 49, 14(2016) 145001 10

Machacek J, Mahapatra D, Schultz D, Ralchenko Y, Moradmand A, Ghazaly M, Chutjian A
SOLAR-WIND ION-DRIVEN X-RAY EMISSION FROM COMETARY AND PLANETARY ATMOSPHERES: MEASUREMENTS AND THEORETICAL PREDICTIONS OF CHARGE-EXCHANGE CROSS-SECTIONS AND EMISSION SPECTRA FOR O6+ + H2O, CO, CO2, CH4, N-2, NO, N2O, AND Ar
The Astrophysical Journal 809, 1(2015) 1-8

Tattersall W, Chiari L, Machacek J, Anderson E, White R, Brunger M, Buckman S, Garcia G, Blanco F, Sullivan J
Positron interactions with water-total elastic, total inelastic, and elastic differential cross section measurements
Journal of Chemical Physics 140, 4(2014) 1-9

Download full publication (PDF 1.5MB)

Mahapatra D, Chutjian A, Machacek J, Mangina R
SIZE DISTRIBUTION OF POSSIBLE DUST CARRIERS FOR THE EXTENDED RED EMISSION
The Astrophysical Journal 790, 2(2014) 1-5

Machacek J, Mahapatra D, Schultz D, Ralchenko Y, Chutjian A, Simcic J, Mawhorter R
Measurement and calculation of absolute single- and double-charge-exchange cross sections for O6+ ions at 1.17 and 2.33 keV/u impacting He and H-2
Physical Review A: Atomic, Molecular and Optical Physics 90, 5(2014) 052708

Anderson E, Boadle R, Machacek J, Chiari L, Makochekanwa C, Buckman S, Brunger M, Garcia G, Blanco F, Ingolfsson O, Sullivan J
Low energy positron interactions with uracil-Total scattering, positronium formation, and differential elastic scattering cross sections
The Journal of Chemical Physics 141, 3(2014) 34306-34306

Download full publication (PDF 1.3MB)

Machacek J, Buckman S, Sullivan J
Threshold effects in positron scattering from isoelectronic series of atoms and molecules
Physical Review A: Atomic, Molecular and Optical Physics 90, 4(2014)

Palihawadana P, Boadle R, Chiari L, Anderson E, Machacek J, Brunger M, Buckman S, Sullivan J
Positron scattering from pyrimidine
Physical Review A: Atomic, Molecular and Optical Physics 88, 1(2013) 7

Mortensen T, Deller A, Isaac C, van der Werf D, Machacek J
Manipulation of the magnetron orbit of a positron cloud in a Penning trap
Physics of Plasmas 20, 1(2013) 1-5

Download full publication (PDF 0.8MB)

Chiari L, Palihawadana P, Machacek J, Makochekanwa C, Garcia G, Blanco F, McEachran R, Brunger M, Buckman S, Sullivan J
Experimental and theoretical cross sections for positron collisions with 3-hydroxy-tetrahydrofuran
Journal of Chemical Physics 138, 7(2013) 1-11

Download full publication (PDF 1.8MB)

Chiari L, Anderson E, Tattersall W, Machacek J, Palihawadana P, Makochekanwa C, Sullivan J, Garcia G, Blanco F, McEachran R, Brunger M, Buckman S
Total, elastic, and inelastic cross sections for positron and electron collisions with tetrahydrofuran
Journal of Chemical Physics 138, 7(2013) 1-15

Download full publication (PDF 1.4MB)

Machacek J, Anderson E, Makochekanwa C, Buckman S, Sullivan J
Positron scattering from molecular hydrogen
Physical Review A: Atomic, Molecular and Optical Physics 88, 4(2013) 1-8

Sullivan J, Machacek J, Buckman S, Bray I
"Comment on "Semiempirical potentials for positron scattering by atoms""
Physical Review A: Atomic, Molecular and Optical Physics 85, 3(2012) 036702,1-3

Machacek J, Furst J, Gay T, Kilkoyne D, McLaughlin K
Orientation of doubly excited states in N-2
Physical Review A: Atomic, Molecular and Optical Physics 86, 4(2012) 041401R 5

Machacek J, Boadle R, Buckman S, Sullivan J
Search for positron quasibound states in the doubly excited region of the helium atom
Physical Review A: Atomic, Molecular and Optical Physics 86, 6(2012) 3

Makochekanwa C, Machacek J, Jones A, Caradonna P, Slaughter D, McEachran R, Sullivan J, Buckman S, Bellm S, Lohmann B, Fursa D, Bray I, Mueller D, Stauffer A, Hoshino M
Low-energy positron interactions with krypton
Physical Review A: Atomic, Molecular and Optical Physics 83, 3(2011) 12

Download full publication (PDF 0.5MB)

Sullivan J, Makochekanwa C, Jones A, Caradonna P, Slaughter D, Machacek J, McEachran R, Mueller D, Buckman S
Forward angle scattering effects in the measurement of total cross sections for positron scattering
Journal of Physics B: Atomic, Molecular and Optical Physics 44, 3(2011) 5

Machacek J, Makochekanwa C, Jones A, Caradonna P, Slaughter D, McEachran R, Sullivan J, Buckman S, Bellm S, Lohmann B, Fursa D, Bray I, Mueller D, Stauffer A
Low-energy positron interactions with xenon
New Journal of Physics 13, 125004(2011) 19

Machacek J, Andrianarijaona V, Furst J, Kilcoyne A, Landers A, Litaker E, McLaughlin K, Gay T, Gay T
Production of excited atomic hydrogen and deuterium from H-2, HD and D-2 photodissociation
Journal of Physics B: Atomic, Molecular and Optical Physics 44, 4(2011) 7

Jones A, Makochekanwa C, Caradonna P, Slaughter D, Machacek J, McEachran R, Sullivan J, Buckman S, Stauffer A, Bray I, Fursa D
Positron scattering from neon and argon
Physical Review A: Atomic, Molecular and Optical Physics 83, 3(2011)

Download full publication (PDF 0.9MB)

Litaker E, Machacek J, Gay T
Detecting an extended light source through a lens
European Journal of Physics 32, 4(2011) 1107-1116

Jones A, Caradonna P, Makochekanwa C, Slaughter D, McEachran R, Machacek J, Sullivan J, Buckman S
Observation of Threshold Effects in Positron Scattering from the Noble Gases
Physical Review Letters 105, 7(2010) 4

Machacek J
Use of partial-wave decomposition to identify resonant interference effects in the photoionization-excitation of argon
Journal of Physics B: Atomic, Molecular and Optical Physics 42, 4(2009)

Machacek J, Furst J, Kilcoyne A
Production of excited atomic hydrogen and deuterium from H2 and D2 photodissociation
Journal of Physics B: Atomic, Molecular and Optical Physics 39, 23(2006) 4871-4882

Machacek J, Bozek J, Furst J, McLaughlin K
Angular momentum partitioning in the dissociation of diatomic molecules
AIP Conference Proceedings 811(2006) 108-113

(34 publications)

Conference paper

Machacek J, Mahapatra D, Schultz D, Ralchenko Y, Moradmand A, El Ghazaly M, Chutjian A
Measurements and Theoretical Predictions of Charge Exchange Cross Sections and Emission Spectra for O6+ with H2O, CO, CO2, CH4, N2, NO, N2O and Ar
International Conference on Photonic, Electronic and Atomic Collisions, ICPEAC 2015 ?, ?(2015)

Sullivan J, Chiari L, Anderson E, Tattersall W, Palihawadana P, Machacek J, Makochekanwa C, McEachran R, Buckman S, Brunger M, Garcia G, Blanco F
Low-energy positron and electron scattering from tetrahydrofuran and 3-hydroxy-tetrahydrofuran
28th International Conference on Photonic, Electronic and Atomic Collisions, ICPEAC 2013 488, SECTION 7(2014) 1

Makochekanwa C, Machacek J, Jones A, Caradonna P, Slaughter D, McEachran R, Sullivan J, Buckman S, Fursa D, Bray I, Stauffer A
Low energy positron scattering from krypton and xenon
International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC 2011) 388, PART 7(2012) 1

Palihawadana P, Machacek J, Makochekanwa C, Sullivan J, Brunger M, Winstead C, McKoy V, Garcia G, Blanco F, Buckman S
Electron and positron scattering from pyrimidine
International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC 2011) 388, PART 5(2012)

Machacek J, Palihawadana P, Makochekanwa C, Sullivan J, Brunger M, Buckman S
Trends in positron scattering from biomolecules
International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC 2011) 388, PART 7(2012)

Caradonna P, Makochekanwa C, Jones A, Machacek J, Sullivan J, Buckman S
A search for Wigner cusps and resonances in positron scattering by atoms and molecules
International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC 2011) 388, PART 7(2012) 1

Sullivan J, Caradonna P, Jones A, Machacek J, Makochekanwa C, McEachran R, Mueller D, Buckman S
Low energy positron interactions with rare gas atoms: threshold features and benchmark cross sections
International Workshop on Slow Positron Beam Techniques 2010 - SLOPOS12 262, 1(2011)

(7 publications)

Journal short contribution

Machacek J, Tattersall W, Boadle R, White J, Brunger M, Buckman S, Sullivan J
Positron scattering from Biomolecules
Journal of Physics: Conference Series (Print) 635(2015)

(1 publications)

Updated: 31 July 2019/ Responsible Officer: Director, RSPhys/ Page Contact: Physics Webmaster