William C. Swann and Sarah L. Gilbert, "Line centers, pressure shift, and pressure broadening of 1530-1560 nm hydrogen cyanide wavelength calibration lines," J. Opt. Soc. Am. B 22, 1749-1756 (2005)
We have measured the line centers and pressure-induced shift and broadening of 25 lines in the rotational–vibrational band of hydrogen cyanide . These lines can be used as wavelength references in the optical fiber communication wavelength division multiplexing C-band (approximately 1530–1565 nm). We find that the pressure shift varies with line number from to (approximately to ). The pressure broadening also varies with line number and is typically between 1 and . We determined the line centers of 21 lines with an expanded uncertainty of 0.01 pm , an improvement of more than 1 order of magnitude over previous line center measurements of this band. We also calculate the molecular constants for the band, yielding improved determination of the band origin frequency and the excited-state molecular constants.
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Line Center, Pressure Shift, and Pressure-Broadening Results for a
Line
Line Center Extrapolated to Zero Pressure (vacuum wavelength, nm)
Shift Coefficient
Broadening Coefficient
1528.926232(10)
0.060(2)
1.0(3)
17(5)
1529.836643(10)
0.071(2)
1.4(3)
24(5)
1531.275090(10)
0.085(2)
2.2(3)
38(4)
1532.801111(10)
0.085(2)
3.2(2)
55(4)
1534.414943(10)
0.058(2)
4.3(2)
73(3)
1535.539723(10)
0.026(2)
4.9(2)
83(3)
1536.116809(10)
0.005(1)
5.0(2)
85(3)
1536.703707(22)
0.35(9)
5.1(1)
87(2)
1537.300409(27)
0.58(12)
5.1(1)
86(2)
1538.523322(11)
1.39(3)
4.8(2)
81(3)
1539.785605(12)
1.87(4)
4.0(2)
67(3)
1541.087342(10)
1.55(3)
3.0(2)
50(3)
1541.753026(11)
1.12(3)
2.6(2)
44(4)
1543.114083(10)
0.043(2)
2.6(3)
44(4)
1545.230028(10)
0.091(2)
4.0(2)
68(3)
1545.955208(10)
0.084(2)
4.5(1)
76(2)
1548.955546(11)
0.001(2)
5.4(1)
90(2)
1549.730587(10)
0.40(2)
5.3(1)
89(2)
1550.515630(11)
0.82(3)
5.2(1)
86(2)
1552.930882(14)
1.86(4)
4.3(2)
71(3)
1554.591255(16)
2.30(6)
3.5(2)
59(3)
1555.436539(12)
2.41(3)
3.2(2)
52(3)
1558.032905(22)
2.49(9)
2.2(3)
36(5)
1560.720279(11)
2.19(3)
1.4(3)
23(4)
1561.636345(10)
2.06(3)
1.2(2)
19(4)
Results are for the measured lines of the band of hydrogen cyanide at a temperature of . The line center vacuum wavelength results are for low-pressure conditions; our measurements (column 2) are values obtained by extrapolating the line center to zero pressure. The broadening coefficient is the pressure dependence of the FWHM of the Lorentzian component of the Voigt line profile. The uncertainties in the final digits of the values are indicated in parentheses. The uncertainties quoted are the expanded uncertainties obtained by applying a coverage factor (i.e., our quoted uncertainty is ).
Table 2
Line Center Vacuum Wavelength Measurement Comparisona
Line
This Paper Line Center Extrapolated to Zero Pressure (nm)
Line center vacuum wavelength results for this measurement compared with those from Ref. [6] for low-pressure conditions; our measurements (column 2) are values obtained by extrapolating the line center to zero pressure. The expanded uncertainties in the final digits of the values are indicated in parentheses. We assumed that the uncertainties given in Ref. [6] are one standard uncertainty and we multiplied them by 2.
Constants were obtained from a fit of our extrapolated zero-pressure line center values to Eq. (2). is the wavenumber of the pure vibrational transition (band origin). , , and are the excited-state molecular constants; and , , and are the ground-state molecular constants. Comparisons with constants reported in Refs. [6, 16] (converted to ) are also shown. The standard uncertainties in the final digits of the values are indicated in parentheses; we assumed that the uncertainties quoted in Ref. [16] are . Our standard uncertainty for the band origin includes a fit uncertainty and a wavelength measurement uncertainty.
Table 4
Calculated Wavenumbers and Vacuum Wavelengths of Line Centersa
R Branch
Wavenumber
Wavelength (nm)
P Branch
Wavenumber
Wavelength (nm)
6547.83810(10)
1527.221633(25)
6480.40226(3)
1543.114084(8)
6546.07370(8)
1527.633273(18)
6477.48325(3)
1543.809474(8)
6544.26885(6)
1528.054581(13)
6474.52527(3)
1544.514784(8)
6542.42358(4)
1528.485564(10)
6471.52840(3)
1545.230025(8)
6540.53793(4)
1528.926231(9)
6468.49272(3)
1545.955208(8)
6538.61193(4)
1529.376588(8)
6465.41828(3)
1546.690341(8)
6536.64562(4)
1529.836645(8)
6462.30516(3)
1547.435435(8)
6534.63904(4)
1530.306408(8)
6459.15344(3)
1548.190500(8)
6532.59224(4)
1530.785886(8)
6455.96319(3)
1548.955548(8)
6530.50525(4)
1531.275088(8)
6452.73448(3)
1549.730587(8)
6528.37812(4)
1531.774020(8)
6449.46740(3)
1550.515629(8)
6526.21089(4)
1532.282693(8)
6446.16201(3)
1551.310685(8)
6524.00362(4)
1532.801112(8)
6442.81840(3)
1552.115765(8)
6521.75633(3)
1533.329289(8)
6439.43664(3)
1552.930879(8)
6519.46910(3)
1533.867229(8)
6436.01682(3)
1553.756039(8)
6517.14195(3)
1534.414943(8)
6432.55902(3)
1554.591255(8)
6514.77496(3)
1534.972439(8)
6429.06332(3)
1555.436539(8)
6512.36815(3)
1535.539724(8)
6425.52981(3)
1556.291901(8)
6509.92160(3)
1536.116810(8)
6421.95857(4)
1557.157353(8)
6507.43535(3)
1536.703703(8)
6418.34968(4)
1558.032905(8)
6504.90946(3)
1537.300413(8)
6414.70324(4)
1558.918569(8)
6502.34398(3)
1537.906949(8)
6411.01934(3)
1559.814356(8)
6499.73898(3)
1538.523321(8)
6407.29806(3)
1560.720278(8)
6497.09451(3)
1539.149536(8)
6403.53949(4)
1561.636345(9)
6494.41063(3)
1539.785605(8)
6399.74373(4)
1562.562569(10)
6491.68740(3)
1540.431537(8)
6395.91087(5)
1563.498962(13)
6488.92489(3)
1541.087341(8)
6392.04100(7)
1564.445534(18)
6486.12315(3)
1541.753028(8)
6388.13423(10)
1565.402298(25)
Line centers between and are calculated from the molecular constants returned by the fit to Eq (2). The uncertainties in the final digit of the values are indicated in parentheses. The uncertainties are combined expanded uncertainties that include our wavelength uncertainty and the molecular constants fit uncertainty (typically ).
Tables (4)
Table 1
Line Center, Pressure Shift, and Pressure-Broadening Results for a
Line
Line Center Extrapolated to Zero Pressure (vacuum wavelength, nm)
Shift Coefficient
Broadening Coefficient
1528.926232(10)
0.060(2)
1.0(3)
17(5)
1529.836643(10)
0.071(2)
1.4(3)
24(5)
1531.275090(10)
0.085(2)
2.2(3)
38(4)
1532.801111(10)
0.085(2)
3.2(2)
55(4)
1534.414943(10)
0.058(2)
4.3(2)
73(3)
1535.539723(10)
0.026(2)
4.9(2)
83(3)
1536.116809(10)
0.005(1)
5.0(2)
85(3)
1536.703707(22)
0.35(9)
5.1(1)
87(2)
1537.300409(27)
0.58(12)
5.1(1)
86(2)
1538.523322(11)
1.39(3)
4.8(2)
81(3)
1539.785605(12)
1.87(4)
4.0(2)
67(3)
1541.087342(10)
1.55(3)
3.0(2)
50(3)
1541.753026(11)
1.12(3)
2.6(2)
44(4)
1543.114083(10)
0.043(2)
2.6(3)
44(4)
1545.230028(10)
0.091(2)
4.0(2)
68(3)
1545.955208(10)
0.084(2)
4.5(1)
76(2)
1548.955546(11)
0.001(2)
5.4(1)
90(2)
1549.730587(10)
0.40(2)
5.3(1)
89(2)
1550.515630(11)
0.82(3)
5.2(1)
86(2)
1552.930882(14)
1.86(4)
4.3(2)
71(3)
1554.591255(16)
2.30(6)
3.5(2)
59(3)
1555.436539(12)
2.41(3)
3.2(2)
52(3)
1558.032905(22)
2.49(9)
2.2(3)
36(5)
1560.720279(11)
2.19(3)
1.4(3)
23(4)
1561.636345(10)
2.06(3)
1.2(2)
19(4)
Results are for the measured lines of the band of hydrogen cyanide at a temperature of . The line center vacuum wavelength results are for low-pressure conditions; our measurements (column 2) are values obtained by extrapolating the line center to zero pressure. The broadening coefficient is the pressure dependence of the FWHM of the Lorentzian component of the Voigt line profile. The uncertainties in the final digits of the values are indicated in parentheses. The uncertainties quoted are the expanded uncertainties obtained by applying a coverage factor (i.e., our quoted uncertainty is ).
Table 2
Line Center Vacuum Wavelength Measurement Comparisona
Line
This Paper Line Center Extrapolated to Zero Pressure (nm)
Line center vacuum wavelength results for this measurement compared with those from Ref. [6] for low-pressure conditions; our measurements (column 2) are values obtained by extrapolating the line center to zero pressure. The expanded uncertainties in the final digits of the values are indicated in parentheses. We assumed that the uncertainties given in Ref. [6] are one standard uncertainty and we multiplied them by 2.
Constants were obtained from a fit of our extrapolated zero-pressure line center values to Eq. (2). is the wavenumber of the pure vibrational transition (band origin). , , and are the excited-state molecular constants; and , , and are the ground-state molecular constants. Comparisons with constants reported in Refs. [6, 16] (converted to ) are also shown. The standard uncertainties in the final digits of the values are indicated in parentheses; we assumed that the uncertainties quoted in Ref. [16] are . Our standard uncertainty for the band origin includes a fit uncertainty and a wavelength measurement uncertainty.
Table 4
Calculated Wavenumbers and Vacuum Wavelengths of Line Centersa
R Branch
Wavenumber
Wavelength (nm)
P Branch
Wavenumber
Wavelength (nm)
6547.83810(10)
1527.221633(25)
6480.40226(3)
1543.114084(8)
6546.07370(8)
1527.633273(18)
6477.48325(3)
1543.809474(8)
6544.26885(6)
1528.054581(13)
6474.52527(3)
1544.514784(8)
6542.42358(4)
1528.485564(10)
6471.52840(3)
1545.230025(8)
6540.53793(4)
1528.926231(9)
6468.49272(3)
1545.955208(8)
6538.61193(4)
1529.376588(8)
6465.41828(3)
1546.690341(8)
6536.64562(4)
1529.836645(8)
6462.30516(3)
1547.435435(8)
6534.63904(4)
1530.306408(8)
6459.15344(3)
1548.190500(8)
6532.59224(4)
1530.785886(8)
6455.96319(3)
1548.955548(8)
6530.50525(4)
1531.275088(8)
6452.73448(3)
1549.730587(8)
6528.37812(4)
1531.774020(8)
6449.46740(3)
1550.515629(8)
6526.21089(4)
1532.282693(8)
6446.16201(3)
1551.310685(8)
6524.00362(4)
1532.801112(8)
6442.81840(3)
1552.115765(8)
6521.75633(3)
1533.329289(8)
6439.43664(3)
1552.930879(8)
6519.46910(3)
1533.867229(8)
6436.01682(3)
1553.756039(8)
6517.14195(3)
1534.414943(8)
6432.55902(3)
1554.591255(8)
6514.77496(3)
1534.972439(8)
6429.06332(3)
1555.436539(8)
6512.36815(3)
1535.539724(8)
6425.52981(3)
1556.291901(8)
6509.92160(3)
1536.116810(8)
6421.95857(4)
1557.157353(8)
6507.43535(3)
1536.703703(8)
6418.34968(4)
1558.032905(8)
6504.90946(3)
1537.300413(8)
6414.70324(4)
1558.918569(8)
6502.34398(3)
1537.906949(8)
6411.01934(3)
1559.814356(8)
6499.73898(3)
1538.523321(8)
6407.29806(3)
1560.720278(8)
6497.09451(3)
1539.149536(8)
6403.53949(4)
1561.636345(9)
6494.41063(3)
1539.785605(8)
6399.74373(4)
1562.562569(10)
6491.68740(3)
1540.431537(8)
6395.91087(5)
1563.498962(13)
6488.92489(3)
1541.087341(8)
6392.04100(7)
1564.445534(18)
6486.12315(3)
1541.753028(8)
6388.13423(10)
1565.402298(25)
Line centers between and are calculated from the molecular constants returned by the fit to Eq (2). The uncertainties in the final digit of the values are indicated in parentheses. The uncertainties are combined expanded uncertainties that include our wavelength uncertainty and the molecular constants fit uncertainty (typically ).