Electron collision cross sections in tetrafluoropropene HFO1234ze

Abstract

In the recent years, the hydrofluoroolefine HFO1234ze(E) (C 3 H 2 F 4 ) has been subject to a growing interest for refrigerant applications. This novel gas is also considered a promising alternative in gaseous particle detectors and gaseous voltage insulation devices, thanks to its low global warming potential. In this contribution, measurements of electron transport coefficients and reaction rates in C 3 H 2 F 4 are analyzed by an iterative procedure. A complete set of scattering cross sections for electrons in C 3 H 2 F 4 has been obtained and validated by a systematic comparison of electron swarm parameters with experimental measurements in pure C 3 H 2 F 4 as well as in gas mixtures of C 3 H 2 F 4 /CO 2 . Since the electron attachment of C 3 H 2 F 4 is strongly influenced by the gas density, accurate calculations of the critical electric field strength in such mixtures are also reported in this paper.

Environment-friendly gas mixtures for Resistive Plate Chambers: an experimental and simulation study

“…On the contrary, the electron avalanche growth can occur at ∼290 Td in pure C 3 H 2 F 4 . When C 3 H 2 F 4 is diluted with CO 2 , the growth of electron avalanches occurs at lower values of the electric field, as reported by experimental studies [11][12][13][14]18]. This observation is also supported by MATOQ simulations.…”

“…However, one of the most significant limitations is that the input electron collision cross sections for all gases are deeply embedded in the MAGBOLTZ code. This makes it challenging to implement new sets of electron collision cross sections, like those for C 3 H 2 F 4 [18], and modifying the code for specific purposes can be complicated. Some attempts have been recently done to implement more user-friendly Monte Carlo simulations similar to MAGBOLTZ.…”

Determination and assessment of a complete and self-consistent electron-neutral collision cross-section set for the C4F7N molecule

“…Based on section 2, we are able to obtain an initial but inconsistent set of cross-sections of C 4 F 7 N. In this section, an iterative procedure is implemented to obtain a complete and self-consistent cross-section set for C 4 F 7 N that can reproduce the experimental electron swarm parameters. This wellknown technique has been described in several publications [25, 30-33, 41, 42] and has also been used for some insulating gases such as CF 3 I [30], C 2 H 2 F 4 [31], C 3 H 2 F 4 [41], c-C 4 F 8 [42]. The procedure consists of adjusting the crosssections of an initial set with the aim of progressively improving the agreement between the calculated swarm parameters and experimental data for the target molecule.…”

Improved Estimation of Uniform AC Electric Breakdown Field Strength of HFO1234ze(E)

“…HFO1234ze(E) shows a strong dependence on pressure due to a three-body electron attachment mechanism [4], [5]. It was measured with a Pulsed Townsend (PT) experiment up to 0.45 bar at which the measured (E/N ) crit was 247 Td [4].…”