Nelly Lacome, Armand Levy, and Guy Guelachvili, "Fourier transform measurement of self-, N2-, and O2-broadening of N2O lines: temperature dependence of linewidths," Appl. Opt. 23, 425-435 (1984)
The high-resolution FT interferometer of the Laboratoire d’Infrarouge at Orsay has been used to investigate the broadening of N2O lines in the 4- and 8-μm spectral regions. All data were taken at both room temperature and 220 K. The uncertainty of the measured values of linewidths was estimated to <4%. From these data, the exponent n of the temperature dependence of linewidths was experimentally determined for the first time, for the systems N2O–N2O, N2O–N2, and N2O–O2. In the first two cases, it was shown that n is nearly J-independent, whereas it seems to vary linearly for N2O–O2. Finally the values of N2O air-broadened linewidths were derived for the two temperatures 295 K and 220 K representing the upper and lower boundaries of middle atmosphere temperatures.
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R. Pearson, T. Sullivan, and L. Frenkel, J. Mol. Spectrosc. 34, 440 (1970).
K. P. Huber and G. Herzberg, Molecular Spectraand Molecular Structure IV—Constants of Diatomic Molecules (Van Nostrand, New York, 1979).
Table VII
Calculated Linewidths for N2O–N2O (in 10−3 cm−1/atm)
T (K)
221
221
240
260
280
295
295
|m|
Obs
Calc
Calc
Calc
Calc
Calc
Obs
1
154.3
142.2
133.1
124.8
117.6
112.8
121.4
6
139.0
135.2
126.9
119.4
112.8
108.3
107.6
11
130.8
126.5
118.6
111.6
105.7
101.7
101.4
16
125.2
125.0
116.5
108.8
102.3
97.9
96.9
21
121.1
123.0
114.9
107.4
100.9
96.6
93.3
26
117.6
119.1
111.5
104.5
98.4
94.3
90.3
31
114.0
114.5
107.1
100.5
94.8
91.0
87.5
36
109.6
110.0
102.7
96.3
90.9
87.2
84.8
41
104.0
105.7
98.5
92.3
87.0
83.5
82.3
46
—
101.5
94.5
88.4
83.3
79.9
79.9
51
—
97.7
90.8
84.8
79.8
76.5
78.0
56
—
94.3
87.6
81.7
76.8
73.5
76.5
61
—
91.3
84.7
79.0
74.1
70.9
—
Table VIII
Calculated Linewidths in N2- and O2-Broadening (in 10−3 cm−1/atm)
N2O–N2
N2O–O2
T
221
221
295
295
221
221
295
295
|m|
Obs
Calc
Calc
Obs
Obs
Calc
Calc
Obs
1
121.0
124.1
97.6
100.9
102.5
111.0
87.9
84.3
6
109.8
114.1
90.0
87.9
99.1
101.1
80.6
77.3
11
102.4
104.8
84.2
82.9
91.3
92.3
74.7
71.6
16
97.8
97.2
77.2
79.3
86.7
84.8
67.7
67.4
21
95.0
93.0
72.4
76.9
83.9
78.6
62.0
64.5
26
93.4
89.7
69.3
74.9
81.9
72.8
57.3
62.5
31
92.4
87.2
67.1
73.6
80.4
67.9
53.5
61.2
36
91.2
84.5
65.5
72.9
79.8
63.6
50.4
60.3
41
89.4
82.1
63.9
72.7
79.8
60.1
48.0
59.5
46
—
79.5
62.5
—
—
57.4
46.1
58.6
51
—
76.8
60.9
—
—
55.1
44.6
—
56
—
73.7
59.3
—
—
52.9
43.3
—
61
—
70.6
57.4
—
—
50.9
42.0
—
Table IX
Experimental Values of the Temperature Exponent n
|m|
N2O–N2O
N2O–N2
N2O–O2
N2O–Air
1
0.831
0.629
0.674
0.637
2
0.876
0.750
0.846
0.768
3
0.887
0.778
0.876
0.797
4
0.889
0.782
0.878
0.801
5
0.888
0.779
0.8705
0.796
6
0.887
0.772
0.862
0.789
7
0.885
0.763
0.854
0.7805
8
0.884
0.7545
0.848
0.772
9
0.883
0.747
0.844
0.765
10
0.882
0.740
0.843
0.759
11
0.882
0.734
0.844
0.755
12
0.883
0.729
0.847
0.7515
13
0.884
0.726
0.852
0.750
14
0.885
0.723
0.858
0.749
15
0.887
0.722
0.866
0.749
16
0.889
0.723
0.874
0.751
17
0.892
0.724
0.882
0.754
18
0.895
0.726
0.890
0.757
19
0.898
0.729
0.8985
0.761
20
0.901
0.733
0.906
0.765
21
0.904
0.7375
0.914
0.770
22
0.907
0.742
0.920
0.775
23
0.910
0.748
0.926
0.781
24
0.913
0.7535
0.930
0.786
25
0.915
0.759
0.934
0.792
26
0.917
0.765
0.937
0.797
27
0.9175
0.770
0.939
0.801
28
0.918
0.775
0.941
0.806
29
0.918
0.779
0.942
0.809
30
0.917
0.783
0.943
0.813
31
0.914
0.785
0.944
0.815
32
0.911
0.787
0.946
0.816
33
0.907
0.787
0.949
0.817
34
0.901
0.786
0.953
0.817
35
0.894
0.783
0.960
0.815
36
0.885
0.778
0.969
0.813
37
0.875
0.771
0.9775
0.809
38
0.863
0.762
0.986
0.803
39
0.848
0.750
0.9955
0.7955
40
0.832
0.735
1.004
0.785
41
0.812
0.719
1.014
0.774
42
0.791
0.695
1.024
0.756
43
0.767
0.681
1.0345
0.747
44
0.740
0.659
1.045
0.731
Table X
Air-Broadening Coefficients of N2O Lines (in 10−3 cm−1/atm) [Values Derived from the Independently Measured N2- and O2-Broadened Linewidths Using Eq. (3)]
T (K)
221
295
|m|
1
117.1
97.4
2
115.7
92.7
3
113.6
90.3
4
111.5
88.5
5
109.5
87.0
6
107.6
85.7
7
105.8
84.5
8
104.2
83.4
9
102.7
82.3
10
101.3
81.4
11
100.1
80.5
12
99.0
79.7
13
98.0
78.9
14
97.0
78.2
15
96.2
77.5
16
95.5
76.8
17
94.8
76.2
18
94.2
75.7
19
93.6
75.2
20
93.1
74.7
21
92.7
74.2
22
92.3
73.8
23
91.9
73.4
24
91.6
73.0
25
91.3
72.6
26
91.0
72.3
27
90.8
72.0
28
90.5
71.7
29
90.3
71.5
30
90.1
71.2
31
89.9
71.0
32
89.7
70.8
33
89.5
70.7
34
89.2
70.5
35
89.0
70.4
36
88.8
70.2
37
88.6
70.1
38
88.3
70.0
39
88.1
70.0
40
87.7
69.9
41
87.4
69.9
42
86.9
69.8
43
86.6
69.8
44
86.1
69.7
Tables (10)
Table I
Summary of Sample Conditions
Spectrum identification
Spectral range
Sample
Path length (cm)
Pressure at room temperature (Torr)
Scanning temperature
1548
N2O
1.010
120.6
1633
N2O
1.312
101.3
295.75
1634
N2O
1.312
100.9
295.25
1642
N2O
1.090
69.77
221.25
1643
4 μm
N2O–N2
10.050
12.07/108.23
295.85
1644
N2O–N2
10.050
12.36/156.24
296.05
1646
N2O–N2
10.084
9.57/161.53
220.25
1647
N2O–N2
10.084
9.51/152.89
220.15
1632
N2O
1.312
100.8
293.35
1635
N2O
1.312
102.9
295.95
1636
8 μm
N2O
1.312
101.8
294.3
1640
N2O–N2
1.330
5.325/183.325
293.95
Table II
Experimental Values of Self-Broadening Coefficients of N2O at 4 and 8 μm (in 10−3 cm−1/atm)
R. Pearson, T. Sullivan, and L. Frenkel, J. Mol. Spectrosc. 34, 440 (1970).
K. P. Huber and G. Herzberg, Molecular Spectraand Molecular Structure IV—Constants of Diatomic Molecules (Van Nostrand, New York, 1979).
Table VII
Calculated Linewidths for N2O–N2O (in 10−3 cm−1/atm)
T (K)
221
221
240
260
280
295
295
|m|
Obs
Calc
Calc
Calc
Calc
Calc
Obs
1
154.3
142.2
133.1
124.8
117.6
112.8
121.4
6
139.0
135.2
126.9
119.4
112.8
108.3
107.6
11
130.8
126.5
118.6
111.6
105.7
101.7
101.4
16
125.2
125.0
116.5
108.8
102.3
97.9
96.9
21
121.1
123.0
114.9
107.4
100.9
96.6
93.3
26
117.6
119.1
111.5
104.5
98.4
94.3
90.3
31
114.0
114.5
107.1
100.5
94.8
91.0
87.5
36
109.6
110.0
102.7
96.3
90.9
87.2
84.8
41
104.0
105.7
98.5
92.3
87.0
83.5
82.3
46
—
101.5
94.5
88.4
83.3
79.9
79.9
51
—
97.7
90.8
84.8
79.8
76.5
78.0
56
—
94.3
87.6
81.7
76.8
73.5
76.5
61
—
91.3
84.7
79.0
74.1
70.9
—
Table VIII
Calculated Linewidths in N2- and O2-Broadening (in 10−3 cm−1/atm)
N2O–N2
N2O–O2
T
221
221
295
295
221
221
295
295
|m|
Obs
Calc
Calc
Obs
Obs
Calc
Calc
Obs
1
121.0
124.1
97.6
100.9
102.5
111.0
87.9
84.3
6
109.8
114.1
90.0
87.9
99.1
101.1
80.6
77.3
11
102.4
104.8
84.2
82.9
91.3
92.3
74.7
71.6
16
97.8
97.2
77.2
79.3
86.7
84.8
67.7
67.4
21
95.0
93.0
72.4
76.9
83.9
78.6
62.0
64.5
26
93.4
89.7
69.3
74.9
81.9
72.8
57.3
62.5
31
92.4
87.2
67.1
73.6
80.4
67.9
53.5
61.2
36
91.2
84.5
65.5
72.9
79.8
63.6
50.4
60.3
41
89.4
82.1
63.9
72.7
79.8
60.1
48.0
59.5
46
—
79.5
62.5
—
—
57.4
46.1
58.6
51
—
76.8
60.9
—
—
55.1
44.6
—
56
—
73.7
59.3
—
—
52.9
43.3
—
61
—
70.6
57.4
—
—
50.9
42.0
—
Table IX
Experimental Values of the Temperature Exponent n
|m|
N2O–N2O
N2O–N2
N2O–O2
N2O–Air
1
0.831
0.629
0.674
0.637
2
0.876
0.750
0.846
0.768
3
0.887
0.778
0.876
0.797
4
0.889
0.782
0.878
0.801
5
0.888
0.779
0.8705
0.796
6
0.887
0.772
0.862
0.789
7
0.885
0.763
0.854
0.7805
8
0.884
0.7545
0.848
0.772
9
0.883
0.747
0.844
0.765
10
0.882
0.740
0.843
0.759
11
0.882
0.734
0.844
0.755
12
0.883
0.729
0.847
0.7515
13
0.884
0.726
0.852
0.750
14
0.885
0.723
0.858
0.749
15
0.887
0.722
0.866
0.749
16
0.889
0.723
0.874
0.751
17
0.892
0.724
0.882
0.754
18
0.895
0.726
0.890
0.757
19
0.898
0.729
0.8985
0.761
20
0.901
0.733
0.906
0.765
21
0.904
0.7375
0.914
0.770
22
0.907
0.742
0.920
0.775
23
0.910
0.748
0.926
0.781
24
0.913
0.7535
0.930
0.786
25
0.915
0.759
0.934
0.792
26
0.917
0.765
0.937
0.797
27
0.9175
0.770
0.939
0.801
28
0.918
0.775
0.941
0.806
29
0.918
0.779
0.942
0.809
30
0.917
0.783
0.943
0.813
31
0.914
0.785
0.944
0.815
32
0.911
0.787
0.946
0.816
33
0.907
0.787
0.949
0.817
34
0.901
0.786
0.953
0.817
35
0.894
0.783
0.960
0.815
36
0.885
0.778
0.969
0.813
37
0.875
0.771
0.9775
0.809
38
0.863
0.762
0.986
0.803
39
0.848
0.750
0.9955
0.7955
40
0.832
0.735
1.004
0.785
41
0.812
0.719
1.014
0.774
42
0.791
0.695
1.024
0.756
43
0.767
0.681
1.0345
0.747
44
0.740
0.659
1.045
0.731
Table X
Air-Broadening Coefficients of N2O Lines (in 10−3 cm−1/atm) [Values Derived from the Independently Measured N2- and O2-Broadened Linewidths Using Eq. (3)]