berkowitz_1977 ============== J\. Berkowitz and J\. H\. D\. Eland, "Photoionization of N2O\: Mechanisms of photoionization and ion dissociation", J\. Chem\. Phys\. 67, 2740 \(1977\) `Source record `__ · :doc:`Catalogue ` · :doc:`Review register ` DOI: `10\.1063/1\.435188 `__ **Source kind:** measurement **Recorded technique:** Photoionisation mass spectrometry with a 3 m normal\-incidence monochromator \(helium Hopfield continuum\) and a quadrupole mass spectrometer, photon resolution 0\.07\-0\.14 A FWHM\: photoion yield curves of N2O\+, NO\+, O\+, N2\+ and N\+ from the threshold to 600 A, and of 14NO\+ and 15NO\+ from 14N15NO \(1 m monochromator, about 0\.7 A, magnetic mass spectrometer\)\. Commercial N2O, used without purification; the sample temperature is not stated \(pp\. 2740\-2741\)\. **Materials in structured entries:** N2O **Dataset quantities:** appearance\_energy, dissociation\_time, fragmentation\_branching\_ratio, ionization\_energy **Contents:** 16 datasets; 0 formulas. Curation notes -------------- PDF pages 2\-14 = journal pages 2740\-2752 \(PDF page 1 is the publisher's cover sheet\)\. Identity checked on the first page\. N2O only\. THE FIRST IONISATION ENERGY \(p\. 2741\)\: the threshold region of the N2O\+ yield \(Fig\. 1, 0\.07 A resolution\) 'has a more\-or\-less linear portion between 961\.72\-962\.60 A, followed by an exponential tail\. This linear region is about 10 times wider than our wavelength resolution \.\.\. It is most likely attributable to rotational P, Q, and R branches\. For the present we take the midpoint of this linear rise as an approximation to the transition involving rotationless levels, and obtain an ionization potential of 12\.886 \+\- 0\.002 eV\.' The final state is the lower spin\-orbit component X 2Pi\_3/2 \(the paper places the 2Pi\_1/2 onset near 960\.9 A with Callomon & Creutzberg's spin\-orbit splitting of 0\.0164 eV\)\. The confidence level of \+\-0\.002 eV is not stated\. EXCITED IONIC STATES \(Rydberg\-series limits\)\: \- A 2Sigma\+ \(000\)\: 'we deduce a limit of 16\.388 \+\- 0\.001 eV' \(p\. 2742; Table I\), by extrapolating four series \(nd pi, ns sigma, nd sigma, np sigma\), 'greatest weight being given to the high Rydberg member of the nd pi series'\. Extracted\. \- A 2Sigma\+ \(100\) 16\.544 \+\- 0\.001 eV and \(001\) 16\.692 \+\- 0\.001 eV \(Table II, p\. 2743\)\: notes only \(vibrationally excited ion\)\. \- C 2Sigma\+\: five series 'all converging to 20\.105 \+\- 0\.002 eV, the ionization potential of the C 2Sigma\+ state' \(p\. 2746; Table VI\)\. Extracted\. QUOTED VALUES \(notes\)\: Tanaka et al\. \(Ref\. 5\), photographic absorption\: X 2Pi\_3/2 limit 12\.88 eV, 2Pi\_1/2 12\.92\_7 eV \(= 959\.1 A\), spin\-orbit 0\.038 eV; A\-state limits 16\.38\_6 and 16\.39\_1 eV \(series III and IV\); He I photoelectron spectrum \(Turner et al\.\)\: the A\-state ionisation potential 16\.39 eV, nu1 ~ 1350, nu3 ~ 2460 cm^\-1 \(Callomon & Creutzberg\: 1345\.52 and 2451 cm^\-1\) \(pp\. 2741\-2742\)\. APPEARANCE ENERGIES \(TC\-965; datasets ae\_NOplus and ae\_Nplus\)\: NO\+ first seen very weakly at ~839\.5 A = 14\.77 eV and with a threshold at ~828 A = 14\.97 eV, 'substantially above the thermochemical threshold for this process \(14\.19 eV\)' \(pp\. 2742\-2743\); an abrupt rise of NO\+ at ~749 A = 16\.55 eV, the onset of N2O\+ A 2Sigma\+ \(100\), none at A \(000\) \(p\. 2743\)\. O\+\: 'The threshold at ~813 A is essentially the thermochemical threshold' \(p\. 2745; no energy printed, not taken\)\. N\+ rises abruptly from 617\.6 A = 20\.075 eV, the linear rise 617\.60\-616\.85 A \(20\.075\-20\.199 eV\) levelling off at 20\.100 eV, against the 0 K thermochemical onset 19\.494 eV = 636\.0 A \(p\. 2748\)\. N2\+ 'first appears at the thermochemical threshold, which is at slightly lower energy than the adiabatic onset of the B state' \(p\. 2749; no number\)\. Electron\-impact thresholds of the metastable N2O\+ \-\> NO\+ \+ N, 15\.1 \+\- 0\.2 eV \(Ref\. 10\) and 15\.7 \+\- 0\.5 eV \(Ref\. 11\), are quoted \(p\. 2743\), not taken\. STATES AND THEIR FRAGMENTS \(the paper's assignments, pp\. 2742\-2751\)\: \- X 2Pi\: stable \(N2O\+\)\. \- 4A'' \(calculated by Hopper, not observed directly\), reached by autoionisation of the Rydberg states below A\: levels below 15\.25 eV dissociate slowly \(the ion survives ~3 x 10^\-7 s, 'encompassing ~10^5 vibrations', p\. 2745\), with isotopic scrambling, to NO\+ \+ N; higher levels dissociate fast to O\+ \+ N2, 'favoring O\+ by a 3\:1 margin' \(p\. 2750\); 'The O\+/NO\+ ratio rises fairly smoothly from threshold, and reaches an essentially constant value of 3 below 780 A' \(p\. 2745; dataset text\_Oplus\_over\_NOplus\)\. \- A 2Sigma\+ \(000\)\: no dissociation \(no NO\+ step\)\. A \(100\) and above\: predissociates to NO\+ \+ N \(ground state\), unscrambled, NO\+ the only product; the ion spends ~10^\-7 s in A before predissociating \(p\. 2745\)\. \- B 2Pi\: NO\+\(1Sigma\+\) \+ N\(2D\) and N2\+\(2Sigma\_g\+\) \+ O\(3P\); no O\+; the N2\+ share grows and the scrambling falls with energy \(Table VII; p\. 2749, p\. 2750\)\. \- C 2Sigma\+\: NO\+, N\+, N2\+ and O\+; from the steps at its threshold 'a branching ratio from the C state to NO\+, N\+, N2\+, and O\+ as ~5\.7\:2\.0\:2\.1\:0\.2' \(p\. 2749, checked on the page\)\. Table VII's C row prints NO\+ 57\*, N2\+ 20\*, N\+ 21\*, O\+ 2\.2\*\: the text and the table exchange N\+ and N2\+ \(TC\-965\)\. 'The dissociations must all be quite rapid' \(p\. 2751\)\. The O\+ spin\-allowed channel opens at 651 A\. AUTOIONISATION BRANCHING TO IONIC STATES \(notes only; no quantity holds the branching of a resonance to the ion's states\)\: A\-state Rydbergs branch at most ~7 % to 4A'', 93 % to X; B\-state Rydbergs ~25 % to 4A'', the rest mainly to X \(p\. 2751\); C\-state Rydbergs \(Table VIII, % to X, A, B, 4A''\)\: np sigma 76, 0, 22, 1\.6 \(members well above B only; Cook et al\. would give ~6 % to A\); np pi 53, 30, 17, 0; nd sigma 81, 5, 13, 1; nd pi 60, 4, 34, 2; ns sigma \-, 64, 34, 2 \(the X cell blank, as printed\)\. Table III gives the A\-state series' preferences in words\. TABLE VII ROWS NOT TAKEN \(no N2O\+ entry, so no stated reference; amplitudes, \*\)\: B 2Pi lower energies 705\-685 A\: NO\+ 20, N2\+ 5\.6, 15NO\+/14NO\+ ~6; B 2Pi higher energies 685\-640 A\: NO\+ 20, N2\+ 16, ~16; C 2Sigma\+ \(0,0,0\) 618 A\: NO\+ 57, N2\+ 20, N\+ 21, O\+ 2\.2, \>= 14\. The 15NO\+/14NO\+ column of the other rows \(~10, ~10, \-, 7\.7, 8\.6, 9\.1, \-, \-\) is the ratio of the unscrambled to the scrambled NO\+ of 14N15NO, not a channel of N2O; below the A \(100\) threshold the autoionisation features in 15NO\+ are 'only ~ four times as intense as those in 14NO\+' \(p\. 2743\)\. NOT EXTRACTED\: Tables I, II, VI \(Rydberg wavelengths and effective quantum numbers\), III and VIII \(series characteristics\: nd pi, ns sigma, nd sigma, np sigma, np pi with defects 0\.05, 0\.95, 0\.23, 0\.65, 0\.61 for A\), V \(a B\-state Rydberg vibrational progression\)\. The ion yield curves \(Figs\. 1\-5\) are raster scans and are not digitised\. **Recorded bibliographic identity status:** VALIDATED\_WITH\_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents. Datasets -------- berkowitz\_1977/adiabatic\_N2O ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "adiabatic_N2O", "material": "N2O", "table": "text", "quantity": "ionization_energy", "unit": "eV", "abscissa": "label", "use": "primary", "parameters": { "kind": "adiabatic", "final_state": "X 2Pi_3/2 (000), rotationless (approximation)" }, "uncertainty": { "column": true, "level": "not stated" } } 1 inline points in the source record. p\. 2741\: the midpoint of the linear rise of the N2O\+ yield \(961\.72\-962\.60 A\), 'as an approximation to the transition involving rotationless levels \.\.\. an ionization potential of 12\.886 \+\- 0\.002 eV'\. To the lower spin\-orbit component X 2Pi\_3/2\. Level of \+\-0\.002 not stated\. berkowitz\_1977/A\_state\_N2O ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "A_state_N2O", "material": "N2O", "table": "text", "quantity": "ionization_energy", "unit": "eV", "abscissa": "label", "use": "primary", "parameters": { "kind": "adiabatic", "final_state": "A 2Sigma+ (000)" }, "uncertainty": { "column": true, "level": "not stated" } } 1 inline points in the source record. p\. 2742 \(and Table I\)\: the common limit of the Rydberg series converging on A 2Sigma\+ \(000\), 16\.388 \+\- 0\.001 eV\. Level not stated\. berkowitz\_1977/C\_state\_N2O ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "C_state_N2O", "material": "N2O", "table": "text", "quantity": "ionization_energy", "unit": "eV", "abscissa": "label", "use": "primary", "parameters": { "kind": "adiabatic", "final_state": "C 2Sigma+ (Rydberg-series limit)" }, "uncertainty": { "column": true, "level": "not stated" } } 1 inline points in the source record. p\. 2746 \(and Table VI's caption\)\: five Rydberg series 'all converging to 20\.105 \+\- 0\.002 eV, the ionization potential of the C 2Sigma\+ state'\. The vibrational level of the limit is not stated \(the series are assigned to the state, not to a vibrational level\)\. Level not stated\. berkowitz\_1977/ae\_NOplus ~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "ae_NOplus", "material": "N2O", "table": "text", "quantity": "appearance_energy", "unit": "eV", "abscissa": "label", "use": "primary", "parameters": { "fragment": "NO+" } } 2 inline points in the source record. pp\. 2742\-2743 \(TC\-965\)\: 'NO\+ is first observed, very weakly, at ~ 839\.5 A = 14\.77 eV, and with considerably greater intensity at a threshold of ~ 828 A = 14\.97 eV\. This is substantially above the thermochemical threshold for this process \(14\.19 eV\)'\. The paper's mechanism\: autoionisation of Rydberg states to the slowly dissociating 4A'' state, the ion surviving ~3e\-7 s\. The eV values are the paper's conversions of the approximate wavelengths; no uncertainty is stated\. Photon resolution 0\.14 A FWHM \(Fig\. 2\(b\)\)\. berkowitz\_1977/ae\_Nplus ~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "ae_Nplus", "material": "N2O", "table": "text", "quantity": "appearance_energy", "unit": "eV", "abscissa": "label", "use": "primary", "parameters": { "fragment": "N+" } } 1 inline points in the source record. p\. 2748 \(TC\-965\)\: 'In the photoion yield curve for N\+ \(Fig\. 5\) we note a rather abrupt rise beginning at 617\.6 A = 20\.075 eV, well above the thermochemical threshold' \(19\.494 eV at 0 K, 636\.0 A\)\. The linear rise runs 617\.60\-616\.85 A \(20\.075\-20\.199 eV\) and levels off at 20\.100 eV, just below the C 2Sigma\+ limit 20\.105 eV; the paper relates the width \(0\.025 eV, about kT\) to rotational energy or the thermally populated \(010\) level\. Weak N\+ below the onset is attributed partly to collision\-induced dissociation\. No uncertainty is stated\. berkowitz\_1977/t4\_Oplus ~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "t4_Oplus", "material": "N2O", "file": "N2O/berkowitz_1977__t4_Oplus.csv", "table": "tbl_130104e0aa54", "quantity": "fragmentation_branching_ratio", "unit": "1", "scale": 0.01, "abscissa": "wavelength", "abscissa_unit": "angstrom", "use": "primary", "parameters": { "channel": "O+ + N2", "reference": "N2O+ (the parent ion) = 100, as printed", "excitation": "photoionisation at the abscissa's wavelength (helium Hopfield continuum, 0.14 A FWHM)", "detection_correction": "none stated (quadrupole mass spectrometer, ion counting)" } } Table IV \(p\. 2745; TC\-965\)\: O\+ intensity with N2O\+ = 100, at the peak ~798\.3 A, the valley ~792 A and the peak ~782 A of the A\-state autoionisation \(the wavelengths printed with '~'\)\. Scale 0\.01\: the printed numbers are per 100 N2O\+\. The paper\: 'essentially all of the O\+ intensity \.\.\. derives from autoionization', so a 584 A measurement 'would strongly discriminate against O\+' \(p\. 2745\)\. No uncertainty is stated\. berkowitz\_1977/t4\_NOplus ~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "t4_NOplus", "material": "N2O", "file": "N2O/berkowitz_1977__t4_NOplus.csv", "table": "tbl_130104e0aa54", "quantity": "fragmentation_branching_ratio", "unit": "1", "scale": 0.01, "abscissa": "wavelength", "abscissa_unit": "angstrom", "use": "primary", "parameters": { "channel": "NO+ + N", "reference": "N2O+ (the parent ion) = 100, as printed", "excitation": "photoionisation at the abscissa's wavelength (helium Hopfield continuum)", "detection_correction": "none stated" } } Table IV \(p\. 2745; TC\-965\)\: NO\+ intensity, printed as '15NO\+ \+ 14NO\+' \(NO\+ 'both mechanisms', p\. 2745\), with N2O\+ = 100\. The column's label suggests the sum was taken from the 14N15NO sample \(1 m monochromator, ~0\.7 A, magnetic mass spectrometer\); the paper does not say\. Doubt \(TC\-965\)\: Table IV's O\+/NO\+ is 2\.5, 1\.9 and 4\.4 at 798\.3, 792 and 782 A, while the text gives an O\+/NO\+ ratio rising from threshold to an essentially constant 3 below 780 A \(p\. 2745\)\. No uncertainty is stated\. berkowitz\_1977/text\_Oplus\_over\_NOplus ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "text_Oplus_over_NOplus", "material": "N2O", "table": "text", "quantity": "fragmentation_branching_ratio", "unit": "1", "abscissa": "label", "use": "check", "parameters": { "channel": "O+ + N2", "reference": "NO+ + N", "excitation": "photoionisation (autoionisation of the A-state Rydberg series to N2O+ 4A'')", "detection_correction": "none stated" } } 1 inline points in the source record. p\. 2745 \(TC\-965\)\: 'The O\+/NO\+ ratio rises fairly smoothly from threshold, and reaches an essentially constant value of 3 below 780 A'; p\. 2750\: the 4A'' state's branching 'favoring O\+ by a 3\:1 margin'\. One significant figure, no uncertainty stated; above 756 A \(below the A \(100\) onset\), where NO\+ comes only from 4A''\. Table IV's ratios at 782\-798 A \(2\.5, 1\.9, 4\.4\) do not show the constancy\. berkowitz\_1977/t7\_yield\_NOplus ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "t7_yield_NOplus", "material": "N2O", "file": "N2O/berkowitz_1977__t7_yield_NOplus.csv", "table": "tbl_be3196b2f333", "quantity": "fragmentation_branching_ratio", "unit": "1", "scale": 0.01, "abscissa": "wavelength", "abscissa_unit": "angstrom", "use": "primary", "parameters": { "channel": "NO+ + N", "reference": "N2O+ (the parent ion) = 100, as printed", "excitation": "photoionisation at the abscissa's wavelength (helium Hopfield continuum)", "detection_correction": "none stated" } } Table VII \(p\. 2748; TC\-965\), the rows without an asterisk\: NO\+ intensity at 600 A \('flat'\), 660 A \('valley'\) and 668\.3 A \('nd pi peak'\), with N2O\+ = 100\. No uncertainty is stated\. berkowitz\_1977/t7\_yield\_N2plus ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "t7_yield_N2plus", "material": "N2O", "file": "N2O/berkowitz_1977__t7_yield_N2plus.csv", "table": "tbl_be3196b2f333", "quantity": "fragmentation_branching_ratio", "unit": "1", "scale": 0.01, "abscissa": "wavelength", "abscissa_unit": "angstrom", "use": "primary", "parameters": { "channel": "N2+ + O", "reference": "N2O+ (the parent ion) = 100, as printed", "excitation": "photoionisation at the abscissa's wavelength (helium Hopfield continuum)", "detection_correction": "none stated" } } Table VII \(p\. 2748; TC\-965\), the rows without an asterisk\: N2\+ intensity with N2O\+ = 100\. The N2\+ curve is of 14N15N\+ from 14N15NO in 667\-725 A and of normal N2\+ in 600\-667 A, 'to minimize the influence of background N2' \(p\. 2747\)\. No uncertainty is stated\. berkowitz\_1977/t7\_yield\_Nplus ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "t7_yield_Nplus", "material": "N2O", "file": "N2O/berkowitz_1977__t7_yield_Nplus.csv", "table": "tbl_be3196b2f333", "quantity": "fragmentation_branching_ratio", "unit": "1", "scale": 0.01, "abscissa": "wavelength", "abscissa_unit": "angstrom", "use": "primary", "parameters": { "channel": "N+ + NO", "reference": "N2O+ (the parent ion) = 100, as printed", "excitation": "photoionisation at the abscissa's wavelength (helium Hopfield continuum)", "detection_correction": "none stated" } } Table VII \(p\. 2748; TC\-965\)\: N\+ intensity at 600 A with N2O\+ = 100 \(3\.5\); a dash at the other wavelengths \(below the 617\.6 A onset\)\. No uncertainty is stated\. berkowitz\_1977/t7\_yield\_Oplus ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "t7_yield_Oplus", "material": "N2O", "file": "N2O/berkowitz_1977__t7_yield_Oplus.csv", "table": "tbl_be3196b2f333", "quantity": "fragmentation_branching_ratio", "unit": "1", "scale": 0.01, "abscissa": "wavelength", "abscissa_unit": "angstrom", "use": "primary", "parameters": { "channel": "O+ + N2", "reference": "N2O+ (the parent ion) = 100, as printed", "excitation": "photoionisation at the abscissa's wavelength (helium Hopfield continuum)", "detection_correction": "none stated" } } Table VII \(p\. 2748; TC\-965\), the rows without an asterisk\: O\+ intensity with N2O\+ = 100\. No uncertainty is stated\. berkowitz\_1977/t7\_feature\_NOplus ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "t7_feature_NOplus", "material": "N2O", "file": "N2O/berkowitz_1977__t7_feature_NOplus.csv", "table": "tbl_be3196b2f333", "quantity": "fragmentation_branching_ratio", "unit": "1", "scale": 0.01, "abscissa": "wavelength", "abscissa_unit": "angstrom", "use": "check", "parameters": { "channel": "NO+ + N", "reference": "the same resonance's amplitude in N2O+ = 100, as printed", "excitation": "photoionisation at the abscissa's wavelength, the resonance's amplitude only", "detection_correction": "none stated" } } Table VII \(p\. 2748; TC\-965\), the rows with an asterisk\: the amplitude \(peak height above the continuum\) of an autoionising resonance of the C\-state Rydberg series in the NO\+ channel, with its amplitude in N2O\+ = 100 \(footnote a\)\. The row id names the series and n\*\. Not a yield ratio at the wavelength\: the continuum under the peak is not included\. use = check\. No uncertainty is stated\. berkowitz\_1977/t7\_feature\_N2plus ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "t7_feature_N2plus", "material": "N2O", "file": "N2O/berkowitz_1977__t7_feature_N2plus.csv", "table": "tbl_be3196b2f333", "quantity": "fragmentation_branching_ratio", "unit": "1", "scale": 0.01, "abscissa": "wavelength", "abscissa_unit": "angstrom", "use": "check", "parameters": { "channel": "N2+ + O", "reference": "the same resonance's amplitude in N2O+ = 100, as printed", "excitation": "photoionisation at the abscissa's wavelength, the resonance's amplitude only", "detection_correction": "none stated" } } Table VII \(p\. 2748; TC\-965\), the rows with an asterisk\: a resonance's amplitude in the N2\+ channel, with its amplitude in N2O\+ = 100 \(as t7\_feature\_NOplus\)\. No uncertainty is stated\. berkowitz\_1977/t7\_feature\_Oplus ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "t7_feature_Oplus", "material": "N2O", "file": "N2O/berkowitz_1977__t7_feature_Oplus.csv", "table": "tbl_be3196b2f333", "quantity": "fragmentation_branching_ratio", "unit": "1", "scale": 0.01, "abscissa": "wavelength", "abscissa_unit": "angstrom", "use": "check", "parameters": { "channel": "O+ + N2", "reference": "the same resonance's amplitude in N2O+ = 100, as printed", "excitation": "photoionisation at the abscissa's wavelength, the resonance's amplitude only", "detection_correction": "none stated" } } Table VII \(p\. 2748; TC\-965\), the rows with an asterisk\: a resonance's amplitude in the O\+ channel, with its amplitude in N2O\+ = 100 \(as t7\_feature\_NOplus\); a dash for the ns sigma n\* = 3 resonance at 666\.7 A\. No uncertainty is stated\. berkowitz\_1977/lifetime\_4A2\_NOplus ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "lifetime_4A2_NOplus", "material": "N2O", "table": "text", "quantity": "dissociation_time", "unit": "s", "abscissa": "label", "use": "check", "parameters": { "channel": "N2O+ (4A'') -> NO+ + N", "kind": "lifetime" } } 1 inline points in the source record. p\. 2745 \(TC\-965\)\: 'the autoionization process requires the N2O\+ to survive for ~3 x 10^\-7 sec in the quartet state', an order of magnitude deduced from the metastable\-ion observations \(the ion must survive ~10^\-6 s in the apparatus\) and the isotopic scrambling, not a measured decay\. For the predissociation from A 2Sigma\+ \(100\) the ion 'spend\[s\] most of its time \(~10^\-7 sec\)' in the A state \(same page\)\. Printed as '~ 3x 10\-7'; no uncertainty\. Formulas -------- No formulas are recorded. Corrections ----------- No dataset errata are recorded in this source record. Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the :doc:`review register ` for the checks and decisions.