| Isotope | Relative Mass | Abundance | Decay Mode | Half Life | Q-value(MeV) |
|---|---|---|---|---|---|
| $^{36}$Ar | 35.96754628(27) | 0.337(3) | stable | - | - |
| $^{37}$Ar | nil | EC, $\beta^+$ | 35.04 d | 0.8135(3) | |
| $^{38}$Ar | 37.9627322(5) | 0.063(1) | stable | - | - |
| $^{39}$Ar | 1.01(8) Bq/kg | $\beta^-$ | 269 y | 0.565(5) | |
| $^{40}$Ar | 39.962383123(3) | 99.600(3) | stable | - | - |
| $^{41}$Ar | nil | $\beta^-$ | 109.34 m | 2.4916(7) | |
| $^{42}$Ar | 6$\times10^{-5}$ Bq/kg | $\beta^-$ | 32.9 y | 0.599(40) |
Info All values are on the liquid-vapor saturation line and at electric field of 500 V/cm unless otherwsie indcated.
| Property | Symbol | Value | Unit |
|---|---|---|---|
| Normal boiling point | $T_\text{NBP}$ | 87.303(2) | K |
| Density | $\rho_\text{NBP}$ | 1.396(1) | g/ml |
| Vapor/Liquid volume ratio | $V(g)/V(l)$ | 241.7 | - |
| Normal freezing point | $T_\text{NFP}$ | 83.8(3) | K |
| Temperature at triple point | $T_\text{Triple}$ | 83.8058 | K |
| Pressure at triple point | $P_\text{triple}$ | 0.68891(2) | bar |
| Density at triple point | $\rho_\text{Triple}$ | 1.417 | g/cm$^3$ |
| Temperature at critical point | $T_\text{C}$ | 150.687(15) | K |
| Pressure at critical point | $P_\text{C}$ | 48.63(3) | bar |
| Density at critical point | $\rho_\text{C}$ | 0.5356(10) | g/cm$^3$ |
| Heat of vaporization | $\Delta H_\text{vap}$ | 161.14 | kJ/kg |
| Heat capacity | $C_\text{p}$ | 1.117 | kJ/kg/K |
| Thermal conductivity | $\rho_\text{NBP}$ | 0.1256 | W/m/K |
| Viscosity | $\eta$ | 270.7 | $\mu$Pas$\cdot$s |
| Speed of sound | $v_\text{s}$ | 838.3(1) | m/s |
| Property | Symbol | Value | Unit |
|---|---|---|---|
| Density | $\rho$ | {{ density | trunc }} | g/cm$^{3}$ |
| Property | Symbol | Value | Unit |
|---|---|---|---|
| Electron mobility | $\mu$ | {{ mu | trunc }} | cm$^2$V$^{-1}$s$^{-1}$ |
| Electron drift velocity | $v$ | {{ v | trunc }} | cm/$\mu$s |
| Effective longitudinal electron energy | $\epsilon_L$ | {{ eps_L | trunc }} | eV |
| Longitudinal diffusion coefficients | $D_L$ | {{ D_L | trunc }} | cm$^2$/s |
| Transverse diffusion coefficients | $D_T$ | {{ D_T | trunc }} | cm$^2$/s |
| Attachment rate constant (O$_2$) | $k_A$ | {{ ka_O2/1e12 | trunc }} | $10^{12}$ s$^{-1}$ |
| Electron lifetime (for 0.1 ppb O$_2$) | $\tau$ | {{ 1/(ka_O2*0.1*1e-9)*1e3 | trunc }} | ms |
| Property | Symbol | Value | Unit |
|---|---|---|---|
| W-value for ionization | $W_\text{i}$ | 23.6(3) | eV/pair |
| Fano factor | $F$ | 0.107 | - |
| Moliere radius | $R_\text{M}$ | 10.0 | cm |
| Radiation length | $X_0$ | 14.0 | cm |
| Nuclear interaction length | $\lambda_\text{i}$ | 85.7 | cm |
| Critical energy | $E_\text{c}$ | 30.5 | MeV |
| Mininum specific energy loss | $(dE/dx)_\text{MIP}$ | 2.12 | MeV/cm |
| Property | Symbol | value | unit |
|---|---|---|---|
| Recombination factor | $R_c$ | {{ Rc_birks | trunc }} (Birks Model) | |
| Attachment factor | $R_a$ | {{ atten | trunc }} | |
| Total electron reduction factor | $R_c * R_a$ | {{ atten * Rc_birks | trunc }} | |
| Light recombination factor | $R_L$ | {{ R_L | trunc }} |
| Property | Symbol | value | unit |
|---|---|---|---|
| Most probable energy loss | $(dE/dx)_\text{MPV}$ | {{ mpv | trunc }} | MeV/cm |
| Mean energy loss | $(dE/dx)_\text{mean}$ | {{ eloss | trunc }} | MeV/cm |
| Property | Symbol | Value | Unit |
|---|---|---|---|
| W-value for scintillation | $W_\text{s}$ | 19.5 | eV/photon |
| W-value for Cerenkov radiation | $W_\text{c}$ | 2700 | eV/photon |
| Scintillation emission peak | $\lambda_\text{scint}$ | 128(10) | nm |
| Decay time | $\tau_\text{scint}$ | 6(2), 1590(100) | ns |
| Dielectric constant | $\epsilon$ | {{ dielec }}(3) | - |
| Index of refraction (at 128 nm) | $n$ | 1.38 | - |
| Rayleigh scattering length (at 128 nm) | $L_\text{R}$ | 95 | cm |
| Absorption length (> 128 nm) | $L_\text{A}$ | >200 | cm |
| Property | Symbol | Value | Unit |
|---|---|---|---|
| Index of refraction | $n$ | {{ iof | trunc }} | |
| Photon group velociy | $v_g$ | {{ v_g | trunc }} | $c$ |
| Property | Value | Unit |
|---|---|---|
| Min E-field ratio for 100% transparency | {{ E_ratio_trans | trunc }} | |
| Wire capacitance in air | {{ wire_c_air | trunc }} | pF/m |
| Wire capacitance in LAr | {{ wire_c_lar | trunc }} | pF/m |
| Cathode high voltage | {{ cathod_hv | trunc }} | kV |
| E fields (bulk, between planes) | {{ E }}, {{ E2 | trunc }}, {{ E3 | trunc }} | kV/cm |
| Drift velocities (bulk, between planes) | {{ v | trunc }}, {{ v2 | trunc }}, {{ v3 | trunc }} | cm/$\mu$s |
| Drift time (bulk, between planes) | {{ t | trunc }}, {{ t2 | trunc }}, {{ t3 | trunc }} | $\mu$s |