Accurate wavelength measurements of the pulsed laser emission from the nitrogen molecule have been made. About one hundred new stimulated emission lines which belong to the first and second positive systems were obtained and identified as to rotational quantum number. The relative intensities of the laser lines in the rotational band spectrum are analyzed. Some characteristics of the oscillations, including the recovery time after the laser pulse, are discussed.
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These lines were coincident with the wavelengths of reported spontaneous emission lines. However, their intensities were anomalous with respect to the over-all pattern of the stimulated emission spectrum. Therefore, the assignment of these lines is questionable.
Observed σ minus value calculated from data of Dieke and Heath (Ref. 4).
The symbols SS, S, M, and W indicate the relative intensities of lines within a given band.
Table II
Stimulated Emission Lines of the Second Positive System C3Πu → B3Πg, v = 0 → 0
σ (cm−1)
λVAC (Å)
Emission line
Intensity
29661.33
3371.39
P1-5
W
59.31
1.62
P1-7,13
M
58.82
1.68
P1′-8
W
58.45
1.72
P1′-12
M
57.96
1.8
aP1′-10 P1-11,9
SS
56.98
1.89
P2-6
W
56.44
1.95
P2-12, P3-4
M
55.98
2.00
P2-7
M
55.65
2.04
P2-11
M
55.14
2.1
aP2-8,10
S
55.02
2.12
P2-9
W
54.56
2.16
P3-5
W
53.97
2.23
P3-11
W
53.58
2.27
P3-6
W
52.95
2.35
P3-10
M
52.72
2.37
P3-7
M
52.42
2.4
aP3-8,9
S
The lines marked by a are broadened on account of the overlapping. The possible error for these lines is ±0.05 cm−1.
Table III
Expected Branches of the First Positive Group
J of the final state
K of the initial state
K−3
K−2
K−1
K
K+1
K+2
K+3
K − 1(F3)
NP13
(OQ13)
(PR13)
K(F2)
(OP12)
(PQ12)
QR12
K + 1(F1)
(P1)
(Q1)
(R1)
K − 1(F3)
OP23
(PQ23)
QR23
K(F2)
P2
(Q2)
R2
K + 1(F1)
QP21
(RQ21)
SR21
K − (F3)
P3
(Q3)
(R3)
K(F2)
QP32
RQ32
SR32
K + 1(F1)
RP31
SQ31
TR31
Branches in parentheses are those observed as laser emission.
Tables (3)
Table I
Stimulated Emission Lines of the First Positive System B3Πg − A3∑u+
These lines were coincident with the wavelengths of reported spontaneous emission lines. However, their intensities were anomalous with respect to the over-all pattern of the stimulated emission spectrum. Therefore, the assignment of these lines is questionable.
Observed σ minus value calculated from data of Dieke and Heath (Ref. 4).
The symbols SS, S, M, and W indicate the relative intensities of lines within a given band.
Table II
Stimulated Emission Lines of the Second Positive System C3Πu → B3Πg, v = 0 → 0
σ (cm−1)
λVAC (Å)
Emission line
Intensity
29661.33
3371.39
P1-5
W
59.31
1.62
P1-7,13
M
58.82
1.68
P1′-8
W
58.45
1.72
P1′-12
M
57.96
1.8
aP1′-10 P1-11,9
SS
56.98
1.89
P2-6
W
56.44
1.95
P2-12, P3-4
M
55.98
2.00
P2-7
M
55.65
2.04
P2-11
M
55.14
2.1
aP2-8,10
S
55.02
2.12
P2-9
W
54.56
2.16
P3-5
W
53.97
2.23
P3-11
W
53.58
2.27
P3-6
W
52.95
2.35
P3-10
M
52.72
2.37
P3-7
M
52.42
2.4
aP3-8,9
S
The lines marked by a are broadened on account of the overlapping. The possible error for these lines is ±0.05 cm−1.
Table III
Expected Branches of the First Positive Group
J of the final state
K of the initial state
K−3
K−2
K−1
K
K+1
K+2
K+3
K − 1(F3)
NP13
(OQ13)
(PR13)
K(F2)
(OP12)
(PQ12)
QR12
K + 1(F1)
(P1)
(Q1)
(R1)
K − 1(F3)
OP23
(PQ23)
QR23
K(F2)
P2
(Q2)
R2
K + 1(F1)
QP21
(RQ21)
SR21
K − (F3)
P3
(Q3)
(R3)
K(F2)
QP32
RQ32
SR32
K + 1(F1)
RP31
SQ31
TR31
Branches in parentheses are those observed as laser emission.
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