Table I
Discrepancies of Previous Measurements of Ethylene Relative Absorption Coefficients in the 10-μ m Rangea
Wavelength α (λ)/α (λ = 10.5326 μ m)Percent difference from Perlmutter
Line (μ m) Perlmutterb Pattyc Hottad Mayere Perssonf R (20)10.243 0.0421 +3.6% 8.1% +113.8% −12.1% P (14)10.532 1 0 0 0 0 P (16)10.548 0.157 −0.6 +6.4 +8.3 +5.1 P (18)10.568 0.097 +15.5 +7.2 +8.2 +8.2 P (20)10.588 0.054g −3.7 +10.1 +1.9 +13.0 P (24)10.629 0.0357 +24.9 +84.9 +98.9 +107.3
a Adapted from
Table V , Perlmutter
et al .
7 ;
b Ref.
7 ;
c Ref.
8 ;
d Ref.
11 ;
e Ref.
12 ;
f Ref.
13 ;
g apparent decimal error in Perlmutter
et al .’s tabulation.
Table II
Absorption Coefficients at C2 H4 (295 K, 760 T)
00°1–02°0 CO2 band 00°1–10°0 CO2 band
Spectral line Wavelengtha (μ m air) Frequency (cm−1 ) Coefficient (atm cm)−1 Errorb (± %) Wavelengtha (μ m air) Frequency (cm−1 ) Coefficient (atm cm−1 ) Errorb (± %) R (40)9.1740695 1090.0288 — — 10.125340 987.62115 3.82 7.4 R (38)9.1826656 1089.0014 0.0320 7.0 10.136208 986.56822 2.99 7.9 R (36)9.1916115 1087.9485 0.254 7.8 10.147246 985.48911 2.13 6.4 R (34)9.2007332 1086.8699 0.0330 7.3 10.158637 984.38399 0.634 5.8 R (32)9.2100919 1085.7655 0.0455 7.9 10.170322 983.25298 1.02 6.3 R (30)9.2196897 1084.6352 0.130 7.4 10.182301 982.09624 0.553 6.0 R (28)9.2295299 1083.4788 0.0342 8.7 10.194575 980.91391 2.02 5.8 R (26)9.2396148 1082.2962 0.0720 5.8 10.207143 979.70612 1.89 5.8 R (24)9.2499459 1081.0874 0.119 7.9 10.220006 978.47298 4.33 6.2 R (22)9.2605266 1079.8522 0.0667 5.4 10.233167 977.21461 2.55 6.0 R (20)9.2713584 1078.5906 0.115 8.7 10.246625 975.93112 1.09 5.5 R (18)9.2824439 1077.3025 0.448 6.1 10.260381 974.62263 0.617 7.4 R (16)9.2851562 1076.9878 0.224 6.6 10.274438 973.28921 0.914 6.4 R (14)9.3053855 1074.6465 0.0654 5.4 10.288797 971.93094 1.41 5.6 R (12)9.3172462 1073.2785 0.0904 8.5 10.303458 970.54793 1.66 5.8 R (10)9.3293703 1071.8837 0.308 6.8 10.318424 969.14023 1.31 5.9 R (8)9.3417582 1070.4623 0.253 8.3 10.333697 967.70792 0.924 5.6 R (6)9.3544136 1069.0141 0.238 9.1 10.349277 966.25105 1.81 5.7 R (4)9.3673384 1067.5391 0.198 5.8 10.365168 964.676967 1.16 6.6 P (4)9.4288858 1060.5707 — — 10.440579 957.80124 1.68 5.5 P (6)9.4433281 1058.9487 0.237 8.7 10.458220 956.18568 2.06 7.7 P (8)9.4580517 1057.3002 0.626 5.5 10.476187 954.54580 1.52 6.0 P (10)9.4730501 1055.6251 0.276 5.7 10.494484c 952.88157 2.98 6.4 P (12)9.4883547 1053.9235 0.124 7.3 10.513117c 951.19299 4.31 6.4 P (14)9.5039363 1052.1956 0.119 9.8 10.532080c 949.48003 30.4 7.6 P (16)9.5198085 1050.4413 0.177 6.3 10.551387c 947.74271 5.07 7.2 P (18)9.5359720 1048.6608 0.607 6.3 10.571037c 945.98096 3.32 6.7 P (20)9.5524277 1046.8543 0.359 5.9 10.591035 944.19476 1.84 6.2 P (22)9.5691793 1045.0217 0.661 5.7 10.611385 942.38407 1.37 6.5 P (24)9.5862176 1043.1633 0.332 6.1 10.632090c 940.54883 2.29 5.8 P (26)9.6035731 1041.2791 0.193 5.8 10.653156 938.68898 1.78 5.9 P (28)9.6212193 1039.3693 0.202 7.5 10.674586 936.80447 1.19 6.1 P (30)9.6391665 1037.4341 1.03 6.5 10.696386 934.89522 1.35 6.2 P (32)9.6574158 1035.4737 0.563 5.7 10.718560 932.96114 1.10 6.0 P (34)9.6759701 1033.4881 1.50 5.7 10.741113 931.00217 1.40 6.8 P (36)9.6953949 1031.4775 0.385 5.9 10.764052 929.01820 1.20 7.7 P (38)9.7139976 1029.4423 0.791 5.6 10.787380 927.00913 1.82 5.7 P (40)9.7334732 1027.3825 0.570 8.8 10.811104 924.97486 0.615 6.0 P (42)9.7532592 1025.2983 0.815 5.4 10.835231 922.91528 — —
a Wavelengths and frequencies in air were obtained from Ref.
18 .
b See text.
c Absorptions at these lines were used to calibrate the spectrophone.
Table III
Comparison of Ethylene (C2 H4 ) Absorption Coefficients for ASL and Pattya
00°1–02°0 CO2 band 9-μ m absorption coefficients (atm cm)−1
Spectral line μ m (air)ASL Pattya ASL/Patty (percent) Wa (Pat-ASL) Δα /ASL (percent) R (30)9.217 0.130 0.22 59.1 0.09 69.2 R (28)9.227 0.0342 0.046 74.4 0.0118 34.5 R (26)9.237 0.0720 0.11 65.5 0.038 52.8 R (24)9.247 0.1190 0.18 66.1 0.061 51.3 R (22)9.258 0.0667 0.10 66.7 0.0333 49.9 R (20)9.269 0.1150 0.17 67.7 0.0550 47.8 R (18)9.280 0.448 0.61 73.4 0.1620 36.2 R (16)9.291 0.224 0.28 80.0 0.0560 25.0 R (14)9.303 0.0654 0.073 89.6 0.0076 11.6 R (12)9.315 0.0904 0.082 110.2 −0.0084 −9.3 R (10)9.327 0.3080 0.33 93.3 0.0220 7.1 P (10)9.470 0.276 0.42 65.7 0.1440 52.2 P (12)9.486 0.124 0.16 77.5 0.0360 29.0 P (14)9.501 0.119 0.14 85.0 0.0210 17.7 P (16)9.517 0.177 0.20 88.5 0.0230 13.0 P (18)9.533 0.607 0.79 76.8 0.1830 30.2 P (20)9.550 0.359 0.40 89.8 0.0410 11.4 P (22)9.567 0.661 0.82 80.6 0.1590 24.1 P (24)9.584 0.332 0.42 79.1 0.0880 26.5 P (26)9.601 0.193 0.23 83.9 0.0370 19.2 P (28)9.619 0.202 0.24 84.2 0.0380 18.8 P (30)9.637 1.03 1.27 81.1 0.2400 23.3 P (32)9.563 0.563 0.72 78.2 0.1570 27.9 P (34)9.673 1.50 2.18 68.8 0.6800 45.3
x
¯ 0.0990 29.8 s 0.1400 18.1
x
¯ 0.0997 30.6 Absolute values s 0.1395 16.7 00°1–10°0 CO2 band 10-μ m absorption coefficients (atm cm)−1
Spectral line μ m (air)ASL Pattya ASL/Pat (percent) Δα (Pat-ASL) Δα /ASL (percent)
R (32)10.168 1.02 0.83 122.9 −0.1900 −18.6 R (30)10.180 0.553 0.56 98.75 0.007 1.3 R (28)10.192 2.02 2.35 86.0 0.3300 16.3 R (26)10.204 1.89 2.16 87.5 0.2700 14.3 R (24)10.217 4.33 5.04 85.9 0.7100 16.4 R (22)10.230 2.55 2.64 96.6 0.0900 3.5 R (20)10.244 1.09 1.27 85.8 0.1800 16.5 R (18)10.258 0.617 0.55 112.2 −0.0670 −10.9 R (16)10.272 0.914 1.04 87.9 0.1260 13.8 R (14)10.286 1.41 1.27 111.0 −0.1400 −9.93 R (12)10.301 1.66 1.94 85.6 0.2800 16.9 R (10)10.316 1.31 1.51 86.8 0.2000 15.3 P (10)10.492 2.98 3.10 96.1 0.1200 4.03 P (12)10.510 4.31 4.35 99.1 0.0400 0.9 P (14)10.529 30.4 29.10 104.5 −1.3000 −4.3 P (16)10.549 5.07 4.55 111.4 −0.5200 −10.3 P (18)10.568 3.32 3.28 101.2 −0.0400 −1.2 P (20)10.588 1.84 1.64 112.2 −0.2000 −10.87 P (22)10.603 1.37 1.09 127.5 −0.2800 −20.44 P (24)10.629 2.29 2.10 109.1 −0.1900 −8.30 P (26)10.650 1.78 2.40 74.2 0.6200 34.83 P (28)10.672 1.19 1.30 91.5 0.1100 9.24 P (30)10.693 1.35 1.63 82.8 0.2800 20.74 P (32)10.716 1.10 0.48 229.2 −0.6200 −56.36 P (34)10.738 1.40 0.54 259.3 −0.8600 −61.43
x
¯ −0.0418 −1.14 s 0.4382 22.1
x
¯ 0.3108 15.9 Absolute values s 0.3053 15.0
a See Ref.
8 . ASL data taken at STP, Patty data taken at std pressure and 300K.
Table IV
Relative Spectral Signature of Ethylene at STPa
α
(
λ
)
α
(
λ
=
10.5326
μ
m
) Wavelength line (m) ASL Perlmutterb Pattyc Hottad Mayere Perssonf X S S /X (%)R (20)10.243 0.036 0.042 0.044 0.045 0.090 0.037 0.049 0.019 38.1 P (14)10.532 1 1 1 1 1 1 — — — P (16)10.548 0.117 0.157 0.156 0.167 0.170 0.165 0.155 0.018 11.5 P (18)10.568 0.109 0.097 0.112 0.104 0.105 0.105 0.105 0.005 4.4 P (20)10.588 0.060 0.058g 0.056g 0.064 0.055 0.061 0.059 0.003 5.2 P (24)10.629 0.075 0.076 0.072 0.053 0.071 0.074 0.070 0.008 11.2 P (26)10.650 0.059 0.036 0.045 0.066 0.060 0.060 0.054 0.010 18.5
a Based on Perlmutter
et al .,
Table V 5 ;
b Ref.
5 ;
c Ref.
8 ;
d Ref.
11 ;
e Ref.
12 ;
f Ref.
13 ;
g Apparent decimal error in Perlmutter
et al .’s tabulation.
Table V
Comparison of C2 H4 Relative Absorption Coefficients from Three Sources at 360-T Pressure
Line Wavelength (μ m) ASLa Perlmutterb Schnellc 10 P (14) 10.532 1 1 1 10 P (16) 10.548 0.19 0.16 0.17 10 P (18) 10.568 0.094 0.084 0.089 10 P (20) 10.588 0.068 0.054 0.063
a Interpolated from 395 and 295 T observations.
b Ref.
7 .
c Unpublished data (see Ref.
7 ).